firebase-ios-sdk/FirebaseAuth/Tests/Unit/FIRUserTests.m

/*
 * Copyright 2017 Google
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#import <Foundation/Foundation.h>
#import <OCMock/OCMock.h>
#import <XCTest/XCTest.h>

#import "FirebaseAuth/Sources/Public/FirebaseAuth/FIRAuthTokenResult.h"
#import "FirebaseAuth/Sources/Public/FirebaseAuth/FIRCustomTokenProviderDelegate.h"
#import "FirebaseAuth/Sources/Public/FirebaseAuth/FIREmailAuthProvider.h"
#import "FirebaseAuth/Sources/Public/FirebaseAuth/FIRFacebookAuthProvider.h"
#import "FirebaseAuth/Sources/Public/FirebaseAuth/FIRGoogleAuthProvider.h"
#import "FirebaseAuth/Sources/Public/FirebaseAuth/FIRUserInfo.h"
#import "FirebaseAuth/Sources/Public/FirebaseAuth/FIRUserMetadata.h"

#import "FirebaseAuth/Sources/Auth/FIRAuthGlobalWorkQueue.h"
#import "FirebaseAuth/Sources/Auth/FIRAuthOperationType.h"
#import "FirebaseAuth/Sources/Auth/FIRAuth_Internal.h"
#import "FirebaseAuth/Sources/Backend/FIRAuthBackend.h"
#import "FirebaseAuth/Sources/Backend/RPC/FIREmailLinkSignInResponse.h"
#import "FirebaseAuth/Sources/Backend/RPC/FIRGetAccountInfoRequest.h"
#import "FirebaseAuth/Sources/Backend/RPC/FIRGetAccountInfoResponse.h"
#import "FirebaseAuth/Sources/Backend/RPC/FIRSecureTokenRequest.h"
#import "FirebaseAuth/Sources/Backend/RPC/FIRSecureTokenResponse.h"
#import "FirebaseAuth/Sources/Backend/RPC/FIRSetAccountInfoRequest.h"
#import "FirebaseAuth/Sources/Backend/RPC/FIRSetAccountInfoResponse.h"
#import "FirebaseAuth/Sources/Backend/RPC/FIRSignUpNewUserResponse.h"
#import "FirebaseAuth/Sources/Backend/RPC/FIRVerifyAssertionRequest.h"
#import "FirebaseAuth/Sources/Backend/RPC/FIRVerifyAssertionResponse.h"
#import "FirebaseAuth/Sources/Backend/RPC/FIRVerifyCustomTokenRequest.h"
#import "FirebaseAuth/Sources/Backend/RPC/FIRVerifyCustomTokenResponse.h"
#import "FirebaseAuth/Sources/Backend/RPC/FIRVerifyPasswordRequest.h"
#import "FirebaseAuth/Sources/Backend/RPC/FIRVerifyPasswordResponse.h"
#import "FirebaseAuth/Sources/Backend/RPC/FIRVerifyPhoneNumberRequest.h"
#import "FirebaseAuth/Sources/Backend/RPC/FIRVerifyPhoneNumberResponse.h"
#import "FirebaseAuth/Sources/SystemService/FIRSecureTokenService.h"
#import "FirebaseAuth/Sources/User/FIRAdditionalUserInfo_Internal.h"
#import "FirebaseAuth/Sources/User/FIRUser_Internal.h"
#import "FirebaseAuth/Sources/Utilities/FIRAuthErrorUtils.h"
#import "FirebaseAuth/Tests/Unit/FIRApp+FIRAuthUnitTests.h"
#import "FirebaseAuth/Tests/Unit/OCMStubRecorder+FIRAuthUnitTests.h"

#if TARGET_OS_IOS
#import "FirebaseAuth/Sources/Public/FirebaseAuth/FIRPhoneAuthProvider.h"

#import "FirebaseAuth/Sources/AuthProvider/Phone/FIRPhoneAuthCredential_Internal.h"
#endif

NS_ASSUME_NONNULL_BEGIN

/** @var kAPIKey
    @brief The fake API key.
 */
static NSString *const kAPIKey = @"FAKE_API_KEY";

/** @var kAccessToken
    @brief A fake access token. The user ID is "testuser".
 */
static NSString *const kAccessToken =
    @"eyJhbGciOimnuzI1NiIsImtpZCI6ImY1YjE4Mjc2YTQ4NjYxZDBhODBiYzh"
     "jM2U5NDM0OTc0ZDFmMWRiNTEifQ."
     "eyJpc3MiOiJodHRwczovL3NlY3VyZXRva2VuLmdvb2dsZS5jb20vZmItc2EtdXBncm"
     "FkZWQiLCJhdWQiOiJ0ZXN0X2F1ZCIsImF1dGhfdGltZSI6MTUyMjM2MDU0OSwidXNlcl9pZCI6InRlc3RfdXNlcl9pZCI"
     "s"
     "InN1YiI6InRlc3Rfc3ViIiwiaWF0IjoxNTIyMzYwNTU3LCJleHAiOjE1MjIzNjQxNTcsImVtYWlsIjoiYXVuaXRlc3R1c"
     "2"
     "VyQGdtYWlsLmNvbSIsImVtYWlsX3ZlcmlmaWVkIjpmYWxzZSwiZmlyZWJhc2UiOnsiaWRlbnRpdGllcyI6eyJlbWFpbCI"
     "6"
     "WyJhdW5pdGVzdHVzZXJAZ21haWwuY29tIl19LCJzaWduX2luX3Byb3ZpZGVyIjoicGFzc3dvcmQifX0=."
     "WFQqSrpVnxx7m"
     "UrdKZA517Sp4ZBt-l2xQzGKNMVE90JB3vuNa-NyWZC-aTYMvND3-4aS3qRnN2kvk9KJAaF3eI_"
     "BKkcbZuq8O7iDVpOvqKC"
     "3QcW0PnwqSPChL3XqoDF322FcBEgemwwgaEVZMuo7GhJvHw-"
     "XtBt1KRXOoGHcr3P6RsvoulUouKQmqt6TP27eZtrgH7jjN"
     "hHm7gjX_WaRmgTOvYsuDbBBGdE15yIVZ3acI4cFUgwMRhaW-"
     "dDV7jTOqZGYJlTsI5oRMehphoVnYnEedJga28r4mqVkPbW"
     "lddL4dVVm85FYmQcRc0b2CLMnSevBDlwu754ZUZmRgnuvDA";

/** @var kAccessToken2
    @brief A fake access token. The user ID is "testuser2".
 */
static NSString *const kAccessToken2 =
    @"eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9."
    @"eyJpc3MiOiJodHRwczovL3NlY3VyZXRva2VuLmdvb2dsZS5jb20vZmItc2EtdXBncmFkZWQiLCJhdWQiOiJ0ZXN0X2F1Z"
    @"CIsImF1dGhfdGltZSI6MTUyMjM2MDU0OSwidXNlcl9pZCI6InRlc3R1c2VyMiIsInN1YiI6InRlc3Rfc3ViIiwiaWF0Ij"
    @"oxNTIyMzYwNTU3LCJleHAiOjE1MjIzNjQxNTcsImVtYWlsIjoiYXVuaXRlc3R1c2VyQGdtYWlsLmNvbSIsImVtYWlsX3Z"
    @"lcmlmaWVkIjpmYWxzZSwiZmlyZWJhc2UiOnsiaWRlbnRpdGllcyI6eyJlbWFpbCI6WyJhdW5pdGVzdHVzZXJAZ21haWwu"
    @"Y29tIl19LCJzaWduX2luX3Byb3ZpZGVyIjoicGFzc3dvcmQifX0.pLFQHyjOyN_"
    @"ibaiPJssFIt1jq5kisazDOA2wRiPtUzZ707FZMl-7F1aFsMnYD5Ha2tNFrCOUnlLlOZRYkyxkIVDTyZfSpCHhn_"
    @"Axs1XZwandin--gIFsxAf5Ygsf7Qkp0BioVnEd4Bcwc9CrZSRdPLuGoIPl6p6b9PM-"
    @"4HLSj8DVuw5A0iVkPG4DHn43TUFt8gzha4A2H91UE8oMn1lWUV2RZDnIoBewKs_"
    @"QSY0wnh6cWNbWQjHaS7t59wQQvH1YC2Scovsz2N4lkMvrRnzgnx3MfCw0BuK27MJ8iUeF0gIH2aSCYeurJuo5uvSuagDJ"
    @"6OaUQJ6xZK_BmEzn-33H9g";

/** @var kAccessTokenWithBase64URLCharacters
    @brief The fake access where the AUD value is "??????????>>>>>>>>>>" and the email value is
        ">>>>>>>>????????@gmail.com".
 */
static NSString *const kAccessTokenWithBase64URLCharacter =
    @"ey?hbGciOimnuzI1NiIsImtpZCI6ImY1YjE4M"
     "jc2YTQ4NjYxZDBhODBiYzhjM2U5NDM0OTc0ZDFmMWRiNTEifQ."
     "eyJpc3MiOiJodHRwczovL3NlY3VyZXRva2VuLmdvb2ds"
     "ZS5jb20vZmItc2EtdXBncmFkZWQiLCJhdWQiOiI_Pz8_Pz8_Pz8_Pj4-Pj4-Pj4-"
     "PiIsImF1dGhfdGltZSI6MTUyMjM2MD"
     "U0OSwidXNlcl9pZCI6InRlc3RfdXNlcl9pZCIsInN1YiI6InRlc3Rfc3ViIiwiaWF0IjoxNTIyMzYwNTU3LCJleHAiOjE"
     "1"
     "MjIzNjQxNTcsImVtYWlsIjoiPj4-Pj4-Pj4_Pz8_Pz8_"
     "P0BnbWFpbC5jb20iLCJlbWFpbF92ZXJpZmllZCI6ZmFsc2UsIm"
     "ZpcmViYXNlIjp7ImlkZW50aXRpZXMiOnsiZW1haWwiOlsiYXVuaXRlc3R1c2VyQGdtYWlsLmNvbSJdfSwic2lnbl9pbl9"
     "w"
     "cm92aWRlciI6IlBhc3N3b3JkIn19.WFQqSrpVnxx7mUrdKZA517Sp4ZBt-l2xQzGKNMVE90JB3vuNa-NyWZC-"
     "aTYMvND3-"
     "4aS3qRnN2kvk9KJAaF3eI_BKkcbZuq8O7iDVpOvqKC3QcW0PnwqSPChL3XqoDF322FcBEgemwwgaEVZMuo7GhJvHw-"
     "XtBt"
     "1KRXOoGHcr3P6RsvoulUouKQmqt6TP27eZtrgH7jjNhHm7gjX_WaRmgTOvYsuDbBBGdE15yIVZ3acI4cFUgwMRhaW-"
     "dDV7"
     "jTOqZGYJlTsI5oRMehphoVnYnEedJga28r4mqVkPbWlddL4dVVm85FYmQcRc0b2CLMnSevBDlwu754ZUZmRgnuvDA";

/** @var kbase64URLEncodedEmail
    @brief The fake email address with a value containing non-valid base64 encoded characters.
    @remarks This is used to ensure that the token parser is able to handle base64 URL encoded
        strings. Note that consecutive question marks in a string without being escaped is not
        legal C99.
 */
static NSString *const kbase64URLEncodedEmail = @">>>>>>>>\?\?\?\?\?\?\?\?@gmail.com";

/** @var kbase64URLEncodedAUD
    @brief The fake AUD with a value containing non-valid base64 encoded characters.
    @remarks This is used to ensure that the token parser is able to handle base64 URL encoded
        strings. Note that consecutive question marks in a string without being escaped is not
        legal C99.
 */
static NSString *const kbase64URLEncodedAUD = @"\?\?\?\?\?\?\?\?\?\?>>>>>>>>>>";

/** @var kAccessTokenLength415
    @brief The fake access token with 415 characters in the claims potion of the token.
 */
static NSString *const kAccessTokenLength415 =
    @"eyJhbGciOimnuzI1NiIsImtpZCI6ImY1YjE4Mjc2YTQ4NjYxZD"
     "BhODBiYzhjM2U5NDM0OTc0ZDFmMWRiNTEifQ."
     "eyJpc3MiOiJodHRwczovL3NlY3VyZXRva2VuLmdvb2dsZS5jb20vdGVzd"
     "CIsImF1ZCI6InRlc3RfYXVkIiwiYXV0aF90aW1lIjoxNTIyMzYwNTQ5LCJ1c2VyX2lkIjoidGVzdF91c2VyX2lkIiwic3"
     "V"
     "iIjoidGVzdF9zdWIiLCJpYXQiOjE1MjIzNjA1NTcsImV4cCI6MTUyMjM2NDE1NywiZW1haWwiOiJhdW5pdGVzdHVzZXJA"
     "Z"
     "21haWwuY29tIiwiZW1haWxfdmVyaWZpZWQiOmZhbHNlLCJmaXJlYmFzZSI6eyJpZGVudGl0aWVzIjp7ImVtYWlsIjpbIm"
     "F"
     "1bml0ZXN0dXNlckBnbWFpbC5jb20iXX0sInNpZ25faW5fcHJvdmlkZXIiOiJwYXNzd29yZCJ9fQ=.WFQqSrpVnxx7m"
     "UrdKZA517Sp4ZBt-l2xQzGKNMVE90JB3vuNa-NyWZC-aTYMvND3-4aS3qRnN2kvk9KJAaF3eI_"
     "BKkcbZuq8O7iDVpOvqKC"
     "3QcW0PnwqSPChL3XqoDF322FcBEgemwwgaEVZMuo7GhJvHw-"
     "XtBt1KRXOoGHcr3P6RsvoulUouKQmqt6TP27eZtrgH7jjN"
     "hHm7gjX_WaRmgTOvYsuDbBBGdE15yIVZ3acI4cFUgwMRhaW-"
     "dDV7jTOqZGYJlTsI5oRMehphoVnYnEedJga28r4mqVkPbW"
     "lddL4dVVm85FYmQcRc0b2CLMnSevBDlwu754ZUZmRgnuvDA";

/** @var kAccessTokenLength416
    @brief The fake access token with 416 characters in the claims potion of the token.
 */
static NSString *const kAccessTokenLength416 =
    @"eyJhbGciOimnuzI1NiIsImtpZCI6ImY1YjE4Mjc2YTQ4NjYxZD"
     "BhODBiYzhjM2U5NDM0OTc0ZDFmMWRiNTEifQ."
     "eyJpc3MiOiJodHRwczovL3NlY3VyZXRva2VuLmdvb2dsZS5jb20vdGVzd"
     "DIiLCJhdWQiOiJ0ZXN0X2F1ZCIsImF1dGhfdGltZSI6MTUyMjM2MDU0OSwidXNlcl9pZCI6InRlc3RfdXNlcl9pZCIsIn"
     "N"
     "1YiI6InRlc3Rfc3ViIiwiaWF0IjoxNTIyMzYwNTU3LCJleHAiOjE1MjIzNjQxNTcsImVtYWlsIjoiYXVuaXRlc3R1c2Vy"
     "Q"
     "GdtYWlsLmNvbSIsImVtYWlsX3ZlcmlmaWVkIjpmYWxzZSwiZmlyZWJhc2UiOnsiaWRlbnRpdGllcyI6eyJlbWFpbCI6Wy"
     "J"
     "hdW5pdGVzdHVzZXJAZ21haWwuY29tIl19LCJzaWduX2luX3Byb3ZpZGVyIjoicGFzc3dvcmQifX0=.WFQqSrpVnxx7m"
     "UrdKZA517Sp4ZBt-l2xQzGKNMVE90JB3vuNa-NyWZC-aTYMvND3-4aS3qRnN2kvk9KJAaF3eI_"
     "BKkcbZuq8O7iDVpOvqKC"
     "3QcW0PnwqSPChL3XqoDF322FcBEgemwwgaEVZMuo7GhJvHw-"
     "XtBt1KRXOoGHcr3P6RsvoulUouKQmqt6TP27eZtrgH7jjN"
     "hHm7gjX_WaRmgTOvYsuDbBBGdE15yIVZ3acI4cFUgwMRhaW-"
     "dDV7jTOqZGYJlTsI5oRMehphoVnYnEedJga28r4mqVkPbW"
     "lddL4dVVm85FYmQcRc0b2CLMnSevBDlwu754ZUZmRgnuvDA";

/** @var kAccessTokenLength4523
    @brief The fake access token with 523 characters in the claims potion of the token.
 */
static NSString *const kAccessTokenLength523 =
    @"eyJhbGciOimnuzI1NiIsImtpZCI6ImY1YjE4Mjc2YTQ4NjYxZD"
     "BhODBiYzhjM2U5NDM0OTc0ZDFmMWRiNTEifQ."
     "eyJpc3MiOiJodHRwczovL3NlY3VyZXRva2VuLmdvb2dsZS5jb20vdGVzd"
     "DQiLCJhdWQiOiJ0ZXN0X2F1ZCIsImF1dGhfdGltZSI6MTUyMjM2MDU0OSwidXNlcl9pZCI6InRlc3RfdXNlcl9pZF81ND"
     "M"
     "yIiwic3ViIjoidGVzdF9zdWIiLCJpYXQiOjE1MjIzNjA1NTcsImV4cCI6MTUyMjM2NDE1OSwiZW1haWwiOiJhdW5pdGVz"
     "d"
     "HVzZXI0QGdtYWlsLmNvbSIsImVtYWlsX3ZlcmlmaWVkIjp0cnVlLCJmaXJlYmFzZSI6eyJpZGVudGl0aWVzIjp7ImVtYW"
     "l"
     "sIjpbImF1bml0ZXN0dXNlckBnbWFpbC5jb20iXX0sInNpZ25faW5fcHJvdmlkZXIiOiJwYXNzd29yZCJ9fQ=."
     "WFQqSrpVn"
     "xx7mUrdKZA517Sp4ZBt-l2xQzGKNMVE90JB3vuNa-NyWZC-aTYMvND3-4aS3qRnN2kvk9KJAaF3eI_"
     "BKkcbZuq8O7iDVpO"
     "vqKC3QcW0PnwqSPChL3XqoDF322FcBEgemwwgaEVZMuo7GhJvHw-"
     "XtBt1KRXOoGHcr3P6RsvoulUouKQmqt6TP27eZtrgH"
     "7jjNhHm7gjX_WaRmgTOvYsuDbBBGdE15yIVZ3acI4cFUgwMRhaW-"
     "dDV7jTOqZGYJlTsI5oRMehphoVnYnEedJga28r4mqV"
     "kPbWlddL4dVVm85FYmQcRc0b2CLMnSevBDlwu754ZUZmRgnuvDA";

/** @var kNewAccessToken
    @brief A new value for the fake access token.
 */
static NSString *const kNewAccessToken = @"NEW_ACCESS_TOKEN";

/** @var kAccessTokenValidInterval
    @brief The time to live for the fake access token.
 */
static const NSTimeInterval kAccessTokenTimeToLive = 60 * 60;

/** @var kRefreshToken
    @brief The fake refresh token.
 */
static NSString *const kRefreshToken = @"REFRESH_TOKEN";

/** @var kLocalID
    @brief The fake local user ID.
 */
static NSString *const kLocalID = @"LOCAL_ID";

/** @var kAnotherLocalID
    @brief The fake local ID of another user.
 */
static NSString *const kAnotherLocalID = @"ANOTHER_LOCAL_ID";

/** @var kGoogleIDToken
    @brief The fake ID token from Google Sign-In.
 */
static NSString *const kGoogleIDToken = @"GOOGLE_ID_TOKEN";

/** @var kFacebookIDToken
    @brief The fake ID token from Facebook Sign-In. Facebook provider ID token is always nil.
 */
static NSString *const kFacebookIDToken = nil;

/** @var kGoogleAccessToken
    @brief The fake access token from Google Sign-In.
 */
static NSString *const kGoogleAccessToken = @"GOOGLE_ACCESS_TOKEN";

/** @var kFacebookAccessToken
    @brief The fake access token from Facebook Sign-In.
 */
static NSString *const kFacebookAccessToken = @"FACEBOOK_ACCESS_TOKEN";

/** @var kEmail
    @brief The fake user email.
 */
static NSString *const kEmail = @"user@company.com";

/** @var kPhoneNumber
    @brief The fake user phone number.
 */
static NSString *const kPhoneNumber = @"12345658";

/** @var kTemporaryProof
    @brief The fake temporary proof.
 */
static NSString *const kTemporaryProof = @"12345658";

/** @var kNewEmail
    @brief A new value for the fake user email.
 */
static NSString *const kNewEmail = @"newuser@company.com";

/** @var kUserName
    @brief The fake user name.
 */
static NSString *const kUserName = @"User Doe";

/** @var kNewDisplayName
    @brief A new value for the fake user display name.
 */
static NSString *const kNewDisplayName = @"New User Doe";

/** @var kPhotoURL
    @brief The fake user profile image URL string.
 */
static NSString *const kPhotoURL = @"https://host.domain/image";

/** @var kNewPhotoURL
    @brief A new value for the fake user profile image URL string..
 */
static NSString *const kNewPhotoURL = @"https://host.domain/new/image";

/** @var kFakePassword
    @brief The fake user password.
 */
static NSString *const kFakePassword = @"123456";

/** @var kNewPassword
    @brief The fake new user password.
 */
static NSString *const kNewPassword = @"1234567";

/** @var kPasswordHash
    @brief The fake user password hash.
 */
static NSString *const kPasswordHash = @"UkVEQUNURUQ=";

/** @var kGoogleUD
    @brief The fake user ID under Google Sign-In.
 */
static NSString *const kGoogleID = @"GOOGLE_ID";

/** @var kGoogleEmail
    @brief The fake user email under Google Sign-In.
 */
static NSString *const kGoogleEmail = @"user@gmail.com";

/** @var kGoogleDisplayName
    @brief The fake user display name under Google Sign-In.
 */
static NSString *const kGoogleDisplayName = @"Google Doe";

/** @var kEmailDisplayName
    @brief The fake user display name for email password user.
 */
static NSString *const kEmailDisplayName = @"Email Doe";

/** @var kFacebookDisplayName
    @brief The fake user display name under Facebook Sign-In.
 */
static NSString *const kFacebookDisplayName = @"Facebook Doe";

/** @var kGooglePhotoURL
    @brief The fake user profile image URL string under Google Sign-In.
 */
static NSString *const kGooglePhotoURL = @"https://googleusercontents.com/user/profile";

/** @var kFacebookID
    @brief The fake user ID under Facebook Login.
 */
static NSString *const kFacebookID = @"FACEBOOK_ID";

/** @var kFacebookEmail
    @brief The fake user email under Facebook Login.
 */
static NSString *const kFacebookEmail = @"user@facebook.com";

/** @var kVerificationCode
    @brief Fake verification code used for testing.
 */
static NSString *const kVerificationCode = @"12345678";

/** @var kVerificationID
    @brief Fake verification ID for testing.
 */
static NSString *const kVerificationID = @"55432";

/** @var kUserArchiverKey
    @brief The key used to archive and unarchive the user object for test NSSecureCoding.
 */
static NSString *const kUserArchiverKey = @"userArchiverKey";

/** @var kCustomToken
    @brief The fake custom token to sign in.
 */
static NSString *const kCustomToken = @"CUSTOM_TOKEN";

/** @var kCreationDateInSeconds
    @brief The fake creation date.
 */
static NSTimeInterval const kCreationDateTimeIntervalInSeconds = 1505858500;

/** @var kLastSignInDateTimeIntervalInSeconds
    @brief The fake last sign in date date.
 */
static NSTimeInterval const kLastSignInDateTimeIntervalInSeconds = 1505858583;

/** @var kExpectationTimeout
    @brief The maximum time waiting for expectations to fulfill.
 */
static const NSTimeInterval kExpectationTimeout = 2;

/** @extention FIRSecureTokenService
    @brief Extends the FIRSecureTokenService class to expose one private method for testing only.
 */
@interface FIRSecureTokenService ()

/** @fn hasValidAccessToken
    @brief private method exposed so it can be mocked to prevent the fake expiration date from
        affecting the the unit tests.
 */
- (BOOL)hasValidAccessToken;
@end

/** @class FIRUserTests
    @brief Tests for @c FIRUser .
 */
@interface FIRUserTests : XCTestCase
@end
@implementation FIRUserTests {
  /** @var _mockBackend
      @brief The mock @c FIRAuthBackendImplementation .
   */
  id _mockBackend;
}

/** @fn googleProfile
    @brief The fake user profile under additional user data in @c FIRVerifyAssertionResponse.
 */
+ (NSDictionary *)googleProfile {
  static NSDictionary *kGoogleProfile = nil;
  static dispatch_once_t onceToken;
  dispatch_once(&onceToken, ^{
    kGoogleProfile = @{@"email" : kGoogleEmail, @"given_name" : @"User", @"family_name" : @"Doe"};
  });
  return kGoogleProfile;
}

- (void)setUp {
  [super setUp];
  _mockBackend = OCMProtocolMock(@protocol(FIRAuthBackendImplementation));
  [FIRAuthBackend setBackendImplementation:_mockBackend];
  [FIRApp resetAppForAuthUnitTests];
}

- (void)tearDown {
  [FIRAuthBackend setDefaultBackendImplementationWithRPCIssuer:nil];
  [super tearDown];
}

#pragma mark - Tests

/** @fn testUserPropertiesAndNSSecureCoding
    @brief Tests properties of the @c FIRUser instance before and after being
        serialized/deserialized.
 */
- (void)testUserPropertiesAndNSSecureCoding {
  // Mock auth provider user info for email/password for GetAccountInfo.
  id mockPasswordUserInfo = OCMClassMock([FIRGetAccountInfoResponseProviderUserInfo class]);
  OCMStub([mockPasswordUserInfo providerID]).andReturn(FIREmailAuthProviderID);
  OCMStub([mockPasswordUserInfo federatedID]).andReturn(kEmail);
  OCMStub([mockPasswordUserInfo email]).andReturn(kEmail);

  // Mock auth provider user info from Google for GetAccountInfo.
  id mockGoogleUserInfo = OCMClassMock([FIRGetAccountInfoResponseProviderUserInfo class]);
  OCMStub([mockGoogleUserInfo providerID]).andReturn(FIRGoogleAuthProviderID);
  OCMStub([mockGoogleUserInfo displayName]).andReturn(kGoogleDisplayName);
  OCMStub([mockGoogleUserInfo photoURL]).andReturn([NSURL URLWithString:kGooglePhotoURL]);
  OCMStub([mockGoogleUserInfo federatedID]).andReturn(kGoogleID);
  OCMStub([mockGoogleUserInfo email]).andReturn(kGoogleEmail);

  // Mock auth provider user info from Facebook for GetAccountInfo.
  id mockFacebookUserInfo = OCMClassMock([FIRGetAccountInfoResponseProviderUserInfo class]);
  OCMStub([mockFacebookUserInfo providerID]).andReturn(FIRFacebookAuthProviderID);
  OCMStub([mockFacebookUserInfo federatedID]).andReturn(kFacebookID);
  OCMStub([mockFacebookUserInfo email]).andReturn(kFacebookEmail);

#if TARGET_OS_IOS
  // Mock auth provider user info from Phone auth provider for GetAccountInfo.
  id mockPhoneUserInfo = OCMClassMock([FIRGetAccountInfoResponseProviderUserInfo class]);
  OCMStub([mockPhoneUserInfo providerID]).andReturn(FIRPhoneAuthProviderID);
  OCMStub([mockPhoneUserInfo phoneNumber]).andReturn(kPhoneNumber);
#endif

  // Mock the root user info object for GetAccountInfo.
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser emailVerified]).andReturn(YES);
  OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(kGoogleDisplayName);
  OCMStub([mockGetAccountInfoResponseUser photoURL]).andReturn([NSURL URLWithString:kPhotoURL]);
  OCMStub([mockGetAccountInfoResponseUser creationDate])
      .andReturn([NSDate dateWithTimeIntervalSince1970:kCreationDateTimeIntervalInSeconds]);
  OCMStub([mockGetAccountInfoResponseUser lastLoginDate])
      .andReturn([NSDate dateWithTimeIntervalSince1970:kLastSignInDateTimeIntervalInSeconds]);
  NSArray *providerUserInfos = @[
#if TARGET_OS_IOS
    mockPhoneUserInfo,
#endif
    mockPasswordUserInfo, mockGoogleUserInfo, mockFacebookUserInfo
  ];
  OCMStub([mockGetAccountInfoResponseUser providerUserInfo]).andReturn(providerUserInfos);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);

  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self
      signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                           completion:^(FIRUser *user) {
                                             // Verify FIRUserInfo properties on FIRUser itself.
                                             XCTAssertEqualObjects(user.providerID, @"Firebase");
                                             XCTAssertEqualObjects(user.uid, kLocalID);
                                             XCTAssertEqualObjects(user.displayName,
                                                                   kGoogleDisplayName);
                                             XCTAssertEqualObjects(user.photoURL,
                                                                   [NSURL URLWithString:kPhotoURL]);
                                             XCTAssertEqualObjects(user.email, kEmail);
                                             XCTAssertEqualObjects(
                                                 user.metadata.creationDate,
                                                 [NSDate dateWithTimeIntervalSince1970:
                                                             kCreationDateTimeIntervalInSeconds]);
                                             XCTAssertEqualObjects(
                                                 user.metadata.lastSignInDate,
                                                 [NSDate dateWithTimeIntervalSince1970:
                                                             kLastSignInDateTimeIntervalInSeconds]);

                                             // Verify FIRUser properties besides providerData
                                             // contents.
                                             XCTAssertFalse(user.anonymous);
                                             XCTAssertTrue(user.emailVerified);
                                             XCTAssertEqualObjects(user.refreshToken,
                                                                   kRefreshToken);
                                             XCTAssertEqual(user.providerData.count,
                                                            providerUserInfos.count);

                                             NSDictionary<NSString *, id<FIRUserInfo>>
                                                 *providerMap = [self
                                                     dictionaryWithUserInfoArray:user.providerData];

                                             // Verify FIRUserInfo properties from email/password.
                                             id<FIRUserInfo> passwordUserInfo =
                                                 providerMap[FIREmailAuthProviderID];
                                             XCTAssertEqualObjects(passwordUserInfo.uid, kEmail);
                                             XCTAssertNil(passwordUserInfo.displayName);
                                             XCTAssertNil(passwordUserInfo.photoURL);
                                             XCTAssertEqualObjects(passwordUserInfo.email, kEmail);

                                             // Verify FIRUserInfo properties from the Google auth
                                             // provider.
                                             id<FIRUserInfo> googleUserInfo =
                                                 providerMap[FIRGoogleAuthProviderID];
                                             XCTAssertEqualObjects(googleUserInfo.uid, kGoogleID);
                                             XCTAssertEqualObjects(googleUserInfo.displayName,
                                                                   kGoogleDisplayName);
                                             XCTAssertEqualObjects(
                                                 googleUserInfo.photoURL,
                                                 [NSURL URLWithString:kGooglePhotoURL]);
                                             XCTAssertEqualObjects(googleUserInfo.email,
                                                                   kGoogleEmail);

                                             // Verify FIRUserInfo properties from the Facebook auth
                                             // provider.
                                             id<FIRUserInfo> facebookUserInfo =
                                                 providerMap[FIRFacebookAuthProviderID];
                                             XCTAssertEqualObjects(facebookUserInfo.uid,
                                                                   kFacebookID);
                                             XCTAssertNil(facebookUserInfo.displayName);
                                             XCTAssertNil(facebookUserInfo.photoURL);
                                             XCTAssertEqualObjects(facebookUserInfo.email,
                                                                   kFacebookEmail);

#if TARGET_OS_IOS
                                             // Verify FIRUserInfo properties from the phone auth
                                             // provider.
                                             id<FIRUserInfo> phoneUserInfo =
                                                 providerMap[FIRPhoneAuthProviderID];
                                             XCTAssertEqualObjects(phoneUserInfo.phoneNumber,
                                                                   kPhoneNumber);
#endif

                                             // Test NSSecureCoding
                                             XCTAssertTrue([FIRUser supportsSecureCoding]);
                                             NSMutableData *data = [NSMutableData data];
                                             NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc]
                                                 initForWritingWithMutableData:data];
                                             [archiver encodeObject:user forKey:kUserArchiverKey];
                                             [archiver finishEncoding];

                                             NSKeyedUnarchiver *unarchiver =
                                                 [[NSKeyedUnarchiver alloc]
                                                     initForReadingWithData:data];
                                             FIRUser *unarchivedUser =
                                                 [unarchiver decodeObjectForKey:kUserArchiverKey];

                                             // Verify NSSecureCoding for FIRUser
                                             XCTAssertEqualObjects(unarchivedUser.providerID,
                                                                   user.providerID);
                                             XCTAssertEqualObjects(unarchivedUser.uid, user.uid);
                                             XCTAssertEqualObjects(unarchivedUser.email,
                                                                   user.email);
                                             XCTAssertEqualObjects(unarchivedUser.photoURL,
                                                                   user.photoURL);
                                             XCTAssertEqualObjects(unarchivedUser.displayName,
                                                                   user.displayName);

                                             // Verify NSSecureCoding properties besides
                                             // providerData contents.
                                             XCTAssertEqual(unarchivedUser.anonymous,
                                                            user.anonymous);
                                             XCTAssertEqual(unarchivedUser.emailVerified,
                                                            user.emailVerified);
                                             XCTAssertEqualObjects(unarchivedUser.refreshToken,
                                                                   user.refreshToken);
                                             XCTAssertEqualObjects(
                                                 unarchivedUser.metadata.creationDate,
                                                 user.metadata.creationDate);
                                             XCTAssertEqualObjects(
                                                 unarchivedUser.metadata.lastSignInDate,
                                                 user.metadata.lastSignInDate);
                                             XCTAssertEqual(unarchivedUser.providerData.count,
                                                            user.providerData.count);

                                             NSDictionary<NSString *, id<FIRUserInfo>>
                                                 *unarchivedProviderMap = [self
                                                     dictionaryWithUserInfoArray:unarchivedUser
                                                                                     .providerData];

                                             // Verify NSSecureCoding properties from
                                             // email/password.
                                             id<FIRUserInfo> unarchivedPasswordUserInfo =
                                                 unarchivedProviderMap[FIREmailAuthProviderID];
                                             XCTAssertEqualObjects(unarchivedPasswordUserInfo.uid,
                                                                   passwordUserInfo.uid);
                                             XCTAssertEqualObjects(
                                                 unarchivedPasswordUserInfo.displayName,
                                                 passwordUserInfo.displayName);
                                             XCTAssertEqualObjects(
                                                 unarchivedPasswordUserInfo.photoURL,
                                                 passwordUserInfo.photoURL);
                                             XCTAssertEqualObjects(unarchivedPasswordUserInfo.email,
                                                                   passwordUserInfo.email);

                                             // Verify NSSecureCoding properties from the Google
                                             // auth provider.
                                             id<FIRUserInfo> unarchivedGoogleUserInfo =
                                                 unarchivedProviderMap[FIRGoogleAuthProviderID];
                                             XCTAssertEqualObjects(unarchivedGoogleUserInfo.uid,
                                                                   googleUserInfo.uid);
                                             XCTAssertEqualObjects(
                                                 unarchivedGoogleUserInfo.displayName,
                                                 googleUserInfo.displayName);
                                             XCTAssertEqualObjects(
                                                 unarchivedGoogleUserInfo.photoURL,
                                                 googleUserInfo.photoURL);
                                             XCTAssertEqualObjects(unarchivedGoogleUserInfo.email,
                                                                   googleUserInfo.email);

                                             // Verify NSSecureCoding properties from the Facebook
                                             // auth provider.
                                             id<FIRUserInfo> unarchivedFacebookUserInfo =
                                                 unarchivedProviderMap[FIRFacebookAuthProviderID];
                                             XCTAssertEqualObjects(unarchivedFacebookUserInfo.uid,
                                                                   facebookUserInfo.uid);
                                             XCTAssertEqualObjects(
                                                 unarchivedFacebookUserInfo.displayName,
                                                 facebookUserInfo.displayName);
                                             XCTAssertEqualObjects(
                                                 unarchivedFacebookUserInfo.photoURL,
                                                 facebookUserInfo.photoURL);
                                             XCTAssertEqualObjects(unarchivedFacebookUserInfo.email,
                                                                   facebookUserInfo.email);

#if TARGET_OS_IOS
                                             // Verify FIRUserInfo properties from the phone auth
                                             // provider.
                                             id<FIRUserInfo> unarchivedPhoneUserInfo =
                                                 unarchivedProviderMap[FIRPhoneAuthProviderID];
                                             XCTAssertEqualObjects(
                                                 unarchivedPhoneUserInfo.phoneNumber,
                                                 phoneUserInfo.phoneNumber);
#endif

                                             [expectation fulfill];
                                           }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testUpdateEmailSuccess
    @brief Tests the flow of a successful @c updateEmail:completion: call.
 */
- (void)testUpdateEmailSuccess {
  id (^mockUserInfoWithDisplayName)(NSString *) = ^(NSString *displayName) {
    id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
    OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
    OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
    OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(displayName);
    OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
    return mockGetAccountInfoResponseUser;
  };
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  id userInfoResponse = mockUserInfoWithDisplayName(kGoogleDisplayName);
  [self
      signInWithEmailPasswordWithMockUserInfoResponse:userInfoResponse
                                           completion:^(FIRUser *user) {
                                             // Pretend that the display name on the server has been
                                             // changed since last request.
                                             [self
                                                 expectGetAccountInfoWithMockUserInfoResponse:
                                                     mockUserInfoWithDisplayName(kNewDisplayName)];
                                             OCMExpect([self->_mockBackend
                                                           setAccountInfo:[OCMArg any]
                                                                 callback:[OCMArg any]])
                                                 .andCallBlock2(^(
                                                     FIRSetAccountInfoRequest *_Nullable request,
                                                     FIRSetAccountInfoResponseCallback callback) {
                                                   XCTAssertEqualObjects(request.APIKey, kAPIKey);
                                                   XCTAssertEqualObjects(request.accessToken,
                                                                         kAccessToken);
                                                   XCTAssertEqualObjects(request.email, kNewEmail);
                                                   XCTAssertNil(request.localID);
                                                   XCTAssertNil(request.displayName);
                                                   XCTAssertNil(request.photoURL);
                                                   XCTAssertNil(request.password);
                                                   XCTAssertNil(request.providers);
                                                   XCTAssertNil(request.deleteAttributes);
                                                   XCTAssertNil(request.deleteProviders);
                                                   dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
                                                     id mockSetAccountInfoResponse = OCMClassMock(
                                                         [FIRSetAccountInfoResponse class]);
                                                     OCMStub([mockSetAccountInfoResponse email])
                                                         .andReturn(kNewEmail);
                                                     OCMStub(
                                                         [mockSetAccountInfoResponse displayName])
                                                         .andReturn(kNewDisplayName);
                                                     callback(mockSetAccountInfoResponse, nil);
                                                   });
                                                 });
                                             [user updateEmail:kNewEmail
                                                    completion:^(NSError *_Nullable error) {
                                                      XCTAssertNil(error);
                                                      XCTAssertEqualObjects(user.email, kNewEmail);
                                                      XCTAssertEqualObjects(user.displayName,
                                                                            kNewDisplayName);
                                                      [expectation fulfill];
                                                    }];
                                           }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testUpdateEmailWithAuthLinkAccountSuccess
    @brief Tests a successful @c updateEmail:completion: call updates provider info.
 */
- (void)testUpdateEmailWithAuthLinkAccountSuccess {
  id (^mockUserInfoWithDisplayName)(NSString *) = ^(NSString *displayName) {
    id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
    OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
    OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
    OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(displayName);
    OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
    return mockGetAccountInfoResponseUser;
  };
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  id userInfoResponse = mockUserInfoWithDisplayName(kGoogleDisplayName);
  [self
      signInWithEmailLinkWithMockUserInfoResponse:userInfoResponse
                                       completion:^(FIRUser *user) {
                                         // Pretend that the display name on the server has been
                                         // changed since last request.
                                         [self expectGetAccountInfoWithMockUserInfoResponse:
                                                   mockUserInfoWithDisplayName(kNewDisplayName)];
                                         OCMExpect([self->_mockBackend setAccountInfo:[OCMArg any]
                                                                             callback:[OCMArg any]])
                                             .andCallBlock2(^(
                                                 FIRSetAccountInfoRequest *_Nullable request,
                                                 FIRSetAccountInfoResponseCallback callback) {
                                               XCTAssertEqualObjects(request.APIKey, kAPIKey);
                                               XCTAssertEqualObjects(request.accessToken,
                                                                     kAccessToken);
                                               XCTAssertEqualObjects(request.email, kNewEmail);
                                               XCTAssertNil(request.localID);
                                               XCTAssertNil(request.displayName);
                                               XCTAssertNil(request.photoURL);
                                               XCTAssertNil(request.password);
                                               XCTAssertNil(request.providers);
                                               XCTAssertNil(request.deleteAttributes);
                                               XCTAssertNil(request.deleteProviders);
                                               dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
                                                 id mockSetAccountInfoResponse = OCMClassMock(
                                                     [FIRSetAccountInfoResponse class]);
                                                 OCMStub([mockSetAccountInfoResponse email])
                                                     .andReturn(kNewEmail);
                                                 OCMStub([mockSetAccountInfoResponse displayName])
                                                     .andReturn(kNewDisplayName);
                                                 callback(mockSetAccountInfoResponse, nil);
                                               });
                                             });
                                         [user updateEmail:kNewEmail
                                                completion:^(NSError *_Nullable error) {
                                                  XCTAssertNil(error);
                                                  XCTAssertEqualObjects(user.email, kNewEmail);
                                                  XCTAssertEqualObjects(user.displayName,
                                                                        kNewDisplayName);
                                                  XCTAssertFalse(user.isAnonymous);
                                                  [expectation fulfill];
                                                }];
                                       }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testUpdateEmailFailure
    @brief Tests the flow of a failed @c updateEmail:completion: call.
 */
- (void)testUpdateEmailFailure {
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(kGoogleDisplayName);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                             completion:^(FIRUser *user) {
                                               [self expectGetAccountInfoWithMockUserInfoResponse:
                                                         mockGetAccountInfoResponseUser];
                                               OCMExpect([self->_mockBackend
                                                             setAccountInfo:[OCMArg any]
                                                                   callback:[OCMArg any]])
                                                   .andDispatchError2([FIRAuthErrorUtils
                                                       invalidEmailErrorWithMessage:nil]);
                                               [user
                                                   updateEmail:kNewEmail
                                                    completion:^(NSError *_Nullable error) {
                                                      XCTAssertTrue([NSThread isMainThread]);
                                                      XCTAssertEqual(error.code,
                                                                     FIRAuthErrorCodeInvalidEmail);
                                                      // Email should not have changed on the client
                                                      // side.
                                                      XCTAssertEqualObjects(user.email, kEmail);
                                                      // User is still signed in.
                                                      XCTAssertEqual([FIRAuth auth].currentUser,
                                                                     user);
                                                      [expectation fulfill];
                                                    }];
                                             }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testUpdateEmailAutoSignOut
    @brief Tests the flow of a failed @c updateEmail:completion: call that automatically signs out.
 */
- (void)testUpdateEmailAutoSignOut {
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(kGoogleDisplayName);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                             completion:^(FIRUser *user) {
                                               [self expectGetAccountInfoWithMockUserInfoResponse:
                                                         mockGetAccountInfoResponseUser];
                                               OCMExpect([self->_mockBackend
                                                             setAccountInfo:[OCMArg any]
                                                                   callback:[OCMArg any]])
                                                   .andDispatchError2([FIRAuthErrorUtils
                                                       invalidUserTokenErrorWithMessage:nil]);
                                               [user updateEmail:kNewEmail
                                                      completion:^(NSError *_Nullable error) {
                                                        XCTAssertTrue([NSThread isMainThread]);
                                                        XCTAssertEqual(
                                                            error.code,
                                                            FIRAuthErrorCodeInvalidUserToken);
                                                        // Email should not have changed on the
                                                        // client side.
                                                        XCTAssertEqualObjects(user.email, kEmail);
                                                        // User is no longer signed in.
                                                        XCTAssertNil([FIRAuth auth].currentUser);
                                                        [expectation fulfill];
                                                      }];
                                             }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

#if TARGET_OS_IOS
/** @fn testUpdatePhoneSuccess
    @brief Tests the flow of a successful @c updatePhoneNumberCredential:completion: call.
 */
- (void)testUpdatePhoneSuccess {
  id (^mockUserInfoWithPhoneNumber)(NSString *) = ^(NSString *phoneNumber) {
    id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
    OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
    OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
    OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
    if (phoneNumber.length) {
      OCMStub([mockGetAccountInfoResponseUser phoneNumber]).andReturn(phoneNumber);
    }
    return mockGetAccountInfoResponseUser;
  };

  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  id userInfoResponse = mockUserInfoWithPhoneNumber(nil);
  [self
      signInWithEmailPasswordWithMockUserInfoResponse:userInfoResponse
                                           completion:^(FIRUser *user) {
                                             [self
                                                 expectVerifyPhoneNumberRequestWithPhoneNumber:
                                                     kPhoneNumber
                                                                               isLinkOperation:NO
                                                                                         error:nil];
                                             id userInfoResponseUpdate =
                                                 mockUserInfoWithPhoneNumber(kPhoneNumber);
                                             [self expectGetAccountInfoWithMockUserInfoResponse:
                                                       userInfoResponseUpdate];

                                             FIRPhoneAuthCredential *credential =
                                                 [[FIRPhoneAuthProvider provider]
                                                     credentialWithVerificationID:kVerificationID
                                                                 verificationCode:
                                                                     kVerificationCode];
                                             [user updatePhoneNumberCredential:credential
                                                                    completion:^(
                                                                        NSError *_Nullable error) {
                                                                      XCTAssertTrue(
                                                                          [NSThread isMainThread]);
                                                                      XCTAssertNil(error);
                                                                      XCTAssertEqualObjects(
                                                                          [FIRAuth auth]
                                                                              .currentUser
                                                                              .phoneNumber,
                                                                          kPhoneNumber);
                                                                      [expectation fulfill];
                                                                    }];
                                           }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testUpdatePhoneNumberFailure
    @brief Tests the flow of a failed @c updatePhoneNumberCredential:completion: call.
 */
- (void)testUpdatePhoneNumberFailure {
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(kGoogleDisplayName);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self
      signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                           completion:^(FIRUser *user) {
                                             OCMExpect([self->_mockBackend
                                                           verifyPhoneNumber:[OCMArg any]
                                                                    callback:[OCMArg any]])
                                                 .andDispatchError2([FIRAuthErrorUtils
                                                     invalidPhoneNumberErrorWithMessage:nil]);
                                             FIRPhoneAuthCredential *credential =
                                                 [[FIRPhoneAuthProvider provider]
                                                     credentialWithVerificationID:kVerificationID
                                                                 verificationCode:
                                                                     kVerificationCode];
                                             [user
                                                 updatePhoneNumberCredential:credential
                                                                  completion:^(
                                                                      NSError *_Nullable error) {
                                                                    XCTAssertTrue(
                                                                        [NSThread isMainThread]);
                                                                    XCTAssertEqual(
                                                                        error.code,
                                                                        FIRAuthErrorCodeInvalidPhoneNumber);
                                                                    XCTAssertEqual(
                                                                        [FIRAuth auth].currentUser,
                                                                        user);
                                                                    [expectation fulfill];
                                                                  }];
                                           }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testUpdatePhoneNumberFailureAutoSignOut
    @brief Tests the flow of a failed @c updatePhoneNumberCredential:completion: call that
        automatically signs out.
 */
- (void)testUpdatePhoneNumberFailureAutoSignOut {
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(kGoogleDisplayName);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self
      signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                           completion:^(FIRUser *user) {
                                             OCMExpect([self->_mockBackend
                                                           verifyPhoneNumber:[OCMArg any]
                                                                    callback:[OCMArg any]])
                                                 .andDispatchError2([FIRAuthErrorUtils
                                                     userTokenExpiredErrorWithMessage:nil]);
                                             FIRPhoneAuthCredential *credential =
                                                 [[FIRPhoneAuthProvider provider]
                                                     credentialWithVerificationID:kVerificationID
                                                                 verificationCode:
                                                                     kVerificationCode];
                                             [user
                                                 updatePhoneNumberCredential:credential
                                                                  completion:^(
                                                                      NSError *_Nullable error) {
                                                                    XCTAssertTrue(
                                                                        [NSThread isMainThread]);
                                                                    XCTAssertEqual(
                                                                        error.code,
                                                                        FIRAuthErrorCodeUserTokenExpired);
                                                                    XCTAssertNil(
                                                                        [FIRAuth auth].currentUser);
                                                                    [expectation fulfill];
                                                                  }];
                                           }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}
#endif

/** @fn testUpdatePasswordSuccess
    @brief Tests the flow of a successful @c updatePassword:completion: call.
 */
- (void)testUpdatePasswordSuccess {
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(kGoogleDisplayName);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                             completion:^(FIRUser *user) {
                                               [self expectGetAccountInfoWithMockUserInfoResponse:
                                                         mockGetAccountInfoResponseUser];
                                               OCMExpect([self->_mockBackend
                                                             setAccountInfo:[OCMArg any]
                                                                   callback:[OCMArg any]])
                                                   .andCallBlock2(^(
                                                       FIRSetAccountInfoRequest *_Nullable request,
                                                       FIRSetAccountInfoResponseCallback callback) {
                                                     XCTAssertEqualObjects(request.APIKey, kAPIKey);
                                                     XCTAssertEqualObjects(request.accessToken,
                                                                           kAccessToken);
                                                     XCTAssertEqualObjects(request.password,
                                                                           kNewPassword);
                                                     XCTAssertNil(request.localID);
                                                     XCTAssertNil(request.displayName);
                                                     XCTAssertNil(request.photoURL);
                                                     XCTAssertNil(request.email);
                                                     XCTAssertNil(request.providers);
                                                     XCTAssertNil(request.deleteAttributes);
                                                     XCTAssertNil(request.deleteProviders);
                                                     dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
                                                       id mockSetAccountInfoResponse = OCMClassMock(
                                                           [FIRSetAccountInfoResponse class]);
                                                       OCMStub(
                                                           [mockSetAccountInfoResponse displayName])
                                                           .andReturn(kNewDisplayName);
                                                       callback(mockSetAccountInfoResponse, nil);
                                                     });
                                                   });
                                               [user updatePassword:kNewPassword
                                                         completion:^(NSError *_Nullable error) {
                                                           XCTAssertTrue([NSThread isMainThread]);
                                                           XCTAssertNil(error);
                                                           XCTAssertFalse(user.isAnonymous);
                                                           [expectation fulfill];
                                                         }];
                                             }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testUpdatePasswordFailure
    @brief Tests the flow of a failed @c updatePassword:completion: call.
 */
- (void)testUpdatePasswordFailure {
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(kGoogleDisplayName);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                             completion:^(FIRUser *user) {
                                               [self expectGetAccountInfoWithMockUserInfoResponse:
                                                         mockGetAccountInfoResponseUser];
                                               OCMExpect([self->_mockBackend
                                                             setAccountInfo:[OCMArg any]
                                                                   callback:[OCMArg any]])
                                                   .andDispatchError2([FIRAuthErrorUtils
                                                       requiresRecentLoginErrorWithMessage:nil]);
                                               [user updatePassword:kNewPassword
                                                         completion:^(NSError *_Nullable error) {
                                                           XCTAssertTrue([NSThread isMainThread]);
                                                           XCTAssertEqual(
                                                               error.code,
                                                               FIRAuthErrorCodeRequiresRecentLogin);
                                                           XCTAssertEqual(
                                                               [FIRAuth auth].currentUser, user);
                                                           [expectation fulfill];
                                                         }];
                                             }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testUpdateEmptyPasswordFailure
    @brief Tests the flow of a failed @c updatePassword:completion: call due to an empty password.
 */
- (void)testUpdateEmptyPasswordFailure {
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(kGoogleDisplayName);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                             completion:^(FIRUser *user) {
                                               [user updatePassword:@""
                                                         completion:^(NSError *_Nullable error) {
                                                           XCTAssertTrue([NSThread isMainThread]);
                                                           XCTAssertEqual(
                                                               error.code,
                                                               FIRAuthErrorCodeWeakPassword);
                                                           [expectation fulfill];
                                                         }];
                                             }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
}

/** @fn testUpdatePasswordFailureAutoSignOut
    @brief Tests the flow of a failed @c updatePassword:completion: call that automatically signs
        out.
 */
- (void)testUpdatePasswordFailureAutoSignOut {
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(kGoogleDisplayName);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                             completion:^(FIRUser *user) {
                                               [self expectGetAccountInfoWithMockUserInfoResponse:
                                                         mockGetAccountInfoResponseUser];
                                               OCMExpect([self->_mockBackend
                                                             setAccountInfo:[OCMArg any]
                                                                   callback:[OCMArg any]])
                                                   .andDispatchError2([FIRAuthErrorUtils
                                                       userDisabledErrorWithMessage:nil]);
                                               [user updatePassword:kNewPassword
                                                         completion:^(NSError *_Nullable error) {
                                                           XCTAssertTrue([NSThread isMainThread]);
                                                           XCTAssertEqual(
                                                               error.code,
                                                               FIRAuthErrorCodeUserDisabled);
                                                           XCTAssertNil([FIRAuth auth].currentUser);
                                                           [expectation fulfill];
                                                         }];
                                             }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testChangeProfileSuccess
    @brief Tests a successful user profile change flow.
 */
- (void)testChangeProfileSuccess {
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(kGoogleDisplayName);
  OCMStub([mockGetAccountInfoResponseUser photoURL]).andReturn(kPhotoURL);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                             completion:^(FIRUser *user) {
                                               [self expectGetAccountInfoWithMockUserInfoResponse:
                                                         mockGetAccountInfoResponseUser];
                                               OCMExpect([self->_mockBackend
                                                             setAccountInfo:[OCMArg any]
                                                                   callback:[OCMArg any]])
                                                   .andCallBlock2(^(
                                                       FIRSetAccountInfoRequest *_Nullable request,
                                                       FIRSetAccountInfoResponseCallback callback) {
                                                     XCTAssertEqualObjects(request.APIKey, kAPIKey);
                                                     XCTAssertEqualObjects(request.accessToken,
                                                                           kAccessToken);
                                                     XCTAssertEqualObjects(request.displayName,
                                                                           kNewDisplayName);
                                                     XCTAssertEqualObjects(
                                                         request.photoURL,
                                                         [NSURL URLWithString:kNewPhotoURL]);
                                                     XCTAssertNil(request.localID);
                                                     XCTAssertNil(request.email);
                                                     XCTAssertNil(request.password);
                                                     XCTAssertNil(request.providers);
                                                     XCTAssertNil(request.deleteAttributes);
                                                     XCTAssertNil(request.deleteProviders);
                                                     dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
                                                       id mockSetAccountInfoResponse = OCMClassMock(
                                                           [FIRSetAccountInfoResponse class]);
                                                       OCMStub(
                                                           [mockSetAccountInfoResponse displayName])
                                                           .andReturn(kNewDisplayName);
                                                       callback(mockSetAccountInfoResponse, nil);
                                                     });
                                                   });
                                               FIRUserProfileChangeRequest *profileChange =
                                                   [user profileChangeRequest];
                                               profileChange.photoURL =
                                                   [NSURL URLWithString:kNewPhotoURL];
                                               profileChange.displayName = kNewDisplayName;
                                               [profileChange commitChangesWithCompletion:^(
                                                                  NSError *_Nullable error) {
                                                 XCTAssertTrue([NSThread isMainThread]);
                                                 XCTAssertNil(error);
                                                 XCTAssertEqualObjects(user.displayName,
                                                                       kNewDisplayName);
                                                 XCTAssertEqualObjects(
                                                     user.photoURL,
                                                     [NSURL URLWithString:kNewPhotoURL]);
                                                 [expectation fulfill];
                                               }];
                                             }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testChangeProfileFailure
    @brief Tests a failed user profile change flow.
 */
- (void)testChangeProfileFailure {
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(kGoogleDisplayName);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                             completion:^(FIRUser *user) {
                                               [self expectGetAccountInfoWithMockUserInfoResponse:
                                                         mockGetAccountInfoResponseUser];
                                               OCMExpect([self->_mockBackend
                                                             setAccountInfo:[OCMArg any]
                                                                   callback:[OCMArg any]])
                                                   .andDispatchError2([FIRAuthErrorUtils
                                                       tooManyRequestsErrorWithMessage:nil]);
                                               FIRUserProfileChangeRequest *profileChange =
                                                   [user profileChangeRequest];
                                               profileChange.displayName = kNewDisplayName;
                                               [profileChange commitChangesWithCompletion:^(
                                                                  NSError *_Nullable error) {
                                                 XCTAssertTrue([NSThread isMainThread]);
                                                 XCTAssertEqual(error.code,
                                                                FIRAuthErrorCodeTooManyRequests);
                                                 XCTAssertEqualObjects(user.displayName,
                                                                       kGoogleDisplayName);
                                                 XCTAssertEqual([FIRAuth auth].currentUser, user);
                                                 [expectation fulfill];
                                               }];
                                             }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testChangeProfileFailureAutoSignOut
    @brief Tests a failed user profile change flow that automatically signs out.
 */
- (void)testChangeProfileFailureAutoSignOut {
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(kGoogleDisplayName);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                             completion:^(FIRUser *user) {
                                               [self expectGetAccountInfoWithMockUserInfoResponse:
                                                         mockGetAccountInfoResponseUser];
                                               OCMExpect([self->_mockBackend
                                                             setAccountInfo:[OCMArg any]
                                                                   callback:[OCMArg any]])
                                                   .andDispatchError2([FIRAuthErrorUtils
                                                       userNotFoundErrorWithMessage:nil]);
                                               FIRUserProfileChangeRequest *profileChange =
                                                   [user profileChangeRequest];
                                               profileChange.displayName = kNewDisplayName;
                                               [profileChange commitChangesWithCompletion:^(
                                                                  NSError *_Nullable error) {
                                                 XCTAssertTrue([NSThread isMainThread]);
                                                 XCTAssertEqual(error.code,
                                                                FIRAuthErrorCodeUserNotFound);
                                                 XCTAssertEqualObjects(user.displayName,
                                                                       kGoogleDisplayName);
                                                 XCTAssertNil([FIRAuth auth].currentUser);
                                                 [expectation fulfill];
                                               }];
                                             }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testReloadSuccess
    @brief Tests the flow of a successful @c reloadWithCompletion: call.
 */
- (void)testReloadSuccess {
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(kGoogleDisplayName);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                             completion:^(FIRUser *user) {
                                               id mockGetAccountInfoResponseUserNew = OCMClassMock(
                                                   [FIRGetAccountInfoResponseUser class]);
                                               OCMStub([mockGetAccountInfoResponseUserNew localID])
                                                   .andReturn(kLocalID);
                                               OCMStub([mockGetAccountInfoResponseUserNew email])
                                                   .andReturn(kNewEmail);
                                               OCMStub(
                                                   [mockGetAccountInfoResponseUserNew displayName])
                                                   .andReturn(kNewDisplayName);
                                               OCMStub(
                                                   [mockGetAccountInfoResponseUserNew passwordHash])
                                                   .andReturn(kPasswordHash);
                                               [self expectGetAccountInfoWithMockUserInfoResponse:
                                                         mockGetAccountInfoResponseUserNew];
                                               [user reloadWithCompletion:^(
                                                         NSError *_Nullable error) {
                                                 XCTAssertTrue([NSThread isMainThread]);
                                                 XCTAssertNil(error);
                                                 XCTAssertEqualObjects(user.email, kNewEmail);
                                                 XCTAssertEqualObjects(user.displayName,
                                                                       kNewDisplayName);
                                                 [expectation fulfill];
                                               }];
                                             }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testGetIDTokenResultSuccess
    @brief Tests the flow of a successful @c getIDTokenResultWithCompletion: call.
 */
- (void)testGetIDTokenResultSuccess {
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(kGoogleDisplayName);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  id mockSecureTokenService = OCMClassMock([FIRSecureTokenService class]);
  OCMStub([mockSecureTokenService hasValidAccessToken]).andReturn(YES);
  [self signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                             completion:^(FIRUser *user) {
                                               [user getIDTokenResultWithCompletion:^(
                                                         FIRAuthTokenResult *_Nullable tokenResult,
                                                         NSError *_Nullable error) {
                                                 XCTAssertTrue([NSThread isMainThread]);
                                                 XCTAssertNil(error);
                                                 XCTAssertEqualObjects(tokenResult.token,
                                                                       kAccessToken);
                                                 XCTAssertTrue(tokenResult.issuedAtDate &&
                                                               [tokenResult.issuedAtDate
                                                                   isKindOfClass:[NSDate class]]);
                                                 XCTAssertTrue(tokenResult.authDate &&
                                                               [tokenResult.authDate
                                                                   isKindOfClass:[NSDate class]]);
                                                 XCTAssertTrue(tokenResult.expirationDate &&
                                                               [tokenResult.expirationDate
                                                                   isKindOfClass:[NSDate class]]);
                                                 XCTAssertEqualObjects(tokenResult.signInProvider,
                                                                       FIREmailAuthProviderID);
                                                 XCTAssertTrue(
                                                     tokenResult.claims &&
                                                     [tokenResult.claims
                                                         isKindOfClass:[NSDictionary class]]);
                                                 [expectation fulfill];
                                               }];
                                             }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testGetIDTokenResultForcingRefreshNoCustomTokenDelegateNoRefreshTokenFailure
    @brief Tests the flow of a failed @c getIDTokenResultForcingRefresh:completion: call when there
   is no refresh token nor custom token provider.
 */
- (void)testGetIDTokenResultForcingRefreshNoCustomTokenDelegateNoRefreshTokenFailure {
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self signInWithCustomTokenNoRefreshTokenWithCompletion:^(FIRUser *user) {
    [user getIDTokenResultForcingRefresh:YES
                              completion:^(FIRAuthTokenResult *_Nullable tokenResult,
                                           NSError *_Nullable error) {
                                XCTAssertTrue([NSThread isMainThread]);
                                XCTAssertNil(tokenResult);
                                XCTAssertEqual(error.code, FIRAuthErrorCodeTokenRefreshUnavailable);
                                XCTAssertEqualObjects(error.userInfo[NSLocalizedDescriptionKey],
                                                      @"No refresh token is available.");
                                [expectation fulfill];
                              }];
  }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testGetIDTokenResultForcingRefreshCustomTokenDelegateNoRefreshTokenSuccess
    @brief Tests the flow of a successful @c getIDTokenResultForcingRefresh:completion: call when no
   refresh token is available, but a custom token provider is set.
 */
- (void)testGetIDTokenResultForcingRefreshCustomTokenDelegateNoRefreshTokenSuccess {
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [FIRAuth auth].customTokenProviderDelegate = (id<FIRCustomTokenProviderDelegate>)self;
  [self signInWithCustomTokenNoRefreshTokenWithCompletion:^(FIRUser *user) {
    OCMExpect([self->_mockBackend verifyCustomToken:[OCMArg any] callback:[OCMArg any]])
        .andCallBlock2(^(FIRVerifyCustomTokenRequest *_Nullable request,
                         FIRVerifyCustomTokenResponseCallback callback) {
          XCTAssertEqualObjects(request.APIKey, kAPIKey);

          dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
            id mockVerifyCustomTokenResponse = OCMClassMock([FIRVerifyCustomTokenResponse class]);
            OCMStub([mockVerifyCustomTokenResponse IDToken]).andReturn(kAccessToken);
            callback(mockVerifyCustomTokenResponse, nil);
          });
        });
    [user getIDTokenResultForcingRefresh:YES
                              completion:^(FIRAuthTokenResult *_Nullable tokenResult,
                                           NSError *_Nullable error) {
                                XCTAssertTrue([NSThread isMainThread]);
                                XCTAssertNil(error);
                                XCTAssertEqualObjects(tokenResult.token, kAccessToken);
                                XCTAssertTrue(
                                    tokenResult.issuedAtDate &&
                                    [tokenResult.issuedAtDate isKindOfClass:[NSDate class]]);
                                XCTAssertTrue(tokenResult.authDate &&
                                              [tokenResult.authDate isKindOfClass:[NSDate class]]);
                                XCTAssertTrue(
                                    tokenResult.expirationDate &&
                                    [tokenResult.expirationDate isKindOfClass:[NSDate class]]);
                                XCTAssertTrue(
                                    tokenResult.claims &&
                                    [tokenResult.claims isKindOfClass:[NSDictionary class]]);
                                [expectation fulfill];
                              }];
  }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testGetIDTokenResultForcingRefreshCustomTokenDelegateUserIDMismatch
    @brief Tests the flow of a failed @c getIDTokenResultForcingRefresh:completion: call with a
   custom token provider, when the user ID does not match the existing signed-in user.
 */
- (void)testGetIDTokenResultForcingRefreshCustomTokenDelegateUserIDMismatch {
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [FIRAuth auth].customTokenProviderDelegate = (id<FIRCustomTokenProviderDelegate>)self;
  [self signInWithCustomTokenNoRefreshTokenWithCompletion:^(FIRUser *user) {
    OCMExpect([self->_mockBackend verifyCustomToken:[OCMArg any] callback:[OCMArg any]])
        .andCallBlock2(^(FIRVerifyCustomTokenRequest *_Nullable request,
                         FIRVerifyCustomTokenResponseCallback callback) {
          XCTAssertEqualObjects(request.APIKey, kAPIKey);

          dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
            id mockVerifyCustomTokenResponse = OCMClassMock([FIRVerifyCustomTokenResponse class]);
            OCMStub([mockVerifyCustomTokenResponse IDToken]).andReturn(kAccessToken2);
            callback(mockVerifyCustomTokenResponse, nil);
          });
        });
    [user getIDTokenResultForcingRefresh:YES
                              completion:^(FIRAuthTokenResult *_Nullable tokenResult,
                                           NSError *_Nullable error) {
                                XCTAssertTrue([NSThread isMainThread]);
                                XCTAssertNil(tokenResult);
                                XCTAssertEqual(error.code, FIRAuthErrorCodeUserMismatch);
                                [expectation fulfill];
                              }];
  }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testGetIDTokenResultForcingRefreshFailure
    @brief Tests the flow successful @c getIDTokenResultForcingRefresh:completion: calls.
 */
- (void)testGetIDTokenResultForcingRefreshSuccess {
  [self getIDTokenResultForcingRefreshSuccessWithIDToken:kAccessToken];
  [self getIDTokenResultForcingRefreshSuccessWithIDToken:kAccessTokenLength415];
  [self getIDTokenResultForcingRefreshSuccessWithIDToken:kAccessTokenLength416];
  [self getIDTokenResultForcingRefreshSuccessWithIDToken:kAccessTokenLength523];
  [self getIDTokenResultForcingRefreshSuccessWithIDToken:kAccessTokenWithBase64URLCharacter];
}

/** @fn testGetIDTokenResultSuccessWithBase64EncodedURL
    @brief Tests the flow of a successful @c getIDTokenResultWithCompletion: call using a base64 url
        encoded string.
 */
- (void)testGetIDTokenResultSuccessWithBase64EncodedURL {
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(kGoogleDisplayName);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self
      signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                           completion:^(FIRUser *user) {
                                             OCMExpect([self->_mockBackend
                                                           secureToken:[OCMArg any]
                                                              callback:[OCMArg any]])
                                                 .andCallBlock2(^(
                                                     FIRSecureTokenRequest *_Nullable request,
                                                     FIRSecureTokenResponseCallback callback) {
                                                   XCTAssertEqualObjects(request.APIKey, kAPIKey);

                                                   dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
                                                     id mockSecureTokenResponse = OCMClassMock(
                                                         [FIRSecureTokenResponse class]);
                                                     OCMStub([mockSecureTokenResponse accessToken])
                                                         .andReturn(
                                                             kAccessTokenWithBase64URLCharacter);
                                                     callback(mockSecureTokenResponse, nil);
                                                   });
                                                 });
                                             [user
                                                 getIDTokenResultForcingRefresh:YES
                                                                     completion:^(
                                                                         FIRAuthTokenResult
                                                                             *_Nullable tokenResult,
                                                                         NSError *_Nullable error) {
                                                                       XCTAssertTrue(
                                                                           [NSThread isMainThread]);
                                                                       XCTAssertNil(error);
                                                                       XCTAssertEqualObjects(
                                                                           tokenResult.token,
                                                                           kAccessTokenWithBase64URLCharacter);
                                                                       XCTAssertTrue(
                                                                           tokenResult
                                                                               .issuedAtDate &&
                                                                           [tokenResult.issuedAtDate
                                                                               isKindOfClass:
                                                                                   [NSDate class]]);
                                                                       XCTAssertTrue(
                                                                           tokenResult.authDate &&
                                                                           [tokenResult.authDate
                                                                               isKindOfClass:
                                                                                   [NSDate class]]);
                                                                       XCTAssertTrue(
                                                                           tokenResult
                                                                               .expirationDate &&
                                                                           [tokenResult
                                                                                   .expirationDate
                                                                               isKindOfClass:
                                                                                   [NSDate class]]);
                                                                       XCTAssertTrue(
                                                                           tokenResult.claims &&
                                                                           [tokenResult.claims
                                                                               isKindOfClass:
                                                                                   [NSDictionary
                                                                                       class]]);
                                                                       NSDictionary *claims =
                                                                           tokenResult.claims;
                                                                       XCTAssertEqualObjects(
                                                                           claims[@"email"],
                                                                           kbase64URLEncodedEmail);
                                                                       XCTAssertEqualObjects(
                                                                           claims[@"aud"],
                                                                           kbase64URLEncodedAUD);
                                                                       [expectation fulfill];
                                                                     }];
                                           }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testGetIDTokenResultForcingRefreshFailure
    @brief Tests the flow of a failed @c getIDTokenResultForcingRefresh:completion: call.
 */
- (void)testGetIDTokenResultForcingRefreshFailure {
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(kGoogleDisplayName);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self
      signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                           completion:^(FIRUser *user) {
                                             OCMExpect([self->_mockBackend
                                                           secureToken:[OCMArg any]
                                                              callback:[OCMArg any]])
                                                 .andCallBlock2(^(
                                                     FIRSecureTokenRequest *_Nullable request,
                                                     FIRSecureTokenResponseCallback callback) {
                                                   XCTAssertEqualObjects(request.APIKey, kAPIKey);

                                                   dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
                                                     NSError *underlying =
                                                         [NSError errorWithDomain:@"Test Error"
                                                                             code:1
                                                                         userInfo:nil];
                                                     callback(nil,
                                                              [FIRAuthErrorUtils
                                                                  networkErrorWithUnderlyingError:
                                                                      underlying]);
                                                   });
                                                 });
                                             [user
                                                 getIDTokenResultForcingRefresh:YES
                                                                     completion:^(
                                                                         FIRAuthTokenResult
                                                                             *_Nullable tokenResult,
                                                                         NSError *_Nullable error) {
                                                                       XCTAssertTrue(
                                                                           [NSThread isMainThread]);
                                                                       XCTAssertNil(tokenResult);
                                                                       XCTAssertEqual(
                                                                           error.code,
                                                                           FIRAuthErrorCodeNetworkError);
                                                                       [expectation fulfill];
                                                                     }];
                                           }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testReloadFailure
    @brief Tests the flow of a failed @c reloadWithCompletion: call.
 */
- (void)testReloadFailure {
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                             completion:^(FIRUser *user) {
                                               OCMExpect([self->_mockBackend
                                                             getAccountInfo:[OCMArg any]
                                                                   callback:[OCMArg any]])
                                                   .andDispatchError2([FIRAuthErrorUtils
                                                       quotaExceededErrorWithMessage:nil]);
                                               [user reloadWithCompletion:^(
                                                         NSError *_Nullable error) {
                                                 XCTAssertTrue([NSThread isMainThread]);
                                                 XCTAssertEqual(error.code,
                                                                FIRAuthErrorCodeQuotaExceeded);
                                                 XCTAssertEqual([FIRAuth auth].currentUser, user);
                                                 [expectation fulfill];
                                               }];
                                             }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testReloadFailureAutoSignOut
    @brief Tests the flow of a failed @c reloadWithCompletion: call that automtatically signs out.
 */
- (void)testReloadFailureAutoSignOut {
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                             completion:^(FIRUser *user) {
                                               OCMExpect([self->_mockBackend
                                                             getAccountInfo:[OCMArg any]
                                                                   callback:[OCMArg any]])
                                                   .andDispatchError2([FIRAuthErrorUtils
                                                       userTokenExpiredErrorWithMessage:nil]);
                                               [user reloadWithCompletion:^(
                                                         NSError *_Nullable error) {
                                                 XCTAssertTrue([NSThread isMainThread]);
                                                 XCTAssertEqual(error.code,
                                                                FIRAuthErrorCodeUserTokenExpired);
                                                 XCTAssertNil([FIRAuth auth].currentUser);
                                                 [expectation fulfill];
                                               }];
                                             }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testReauthenticateSuccess
    @brief Tests the flow of a successful @c reauthenticateWithCredential:completion: call.
 */
- (void)testReauthenticateSuccess {
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(kGoogleDisplayName);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self
      signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                           completion:^(FIRUser *user) {
                                             OCMExpect([self->_mockBackend
                                                           verifyPassword:[OCMArg any]
                                                                 callback:[OCMArg any]])
                                                 .andCallBlock2(^(
                                                     FIRVerifyPasswordRequest *_Nullable request,
                                                     FIRVerifyPasswordResponseCallback callback) {
                                                   dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
                                                     id mockVerifyPasswordResponse = OCMClassMock(
                                                         [FIRVerifyPasswordResponse class]);
                                                     // New authentication comes back with new
                                                     // access token.
                                                     OCMStub([mockVerifyPasswordResponse IDToken])
                                                         .andReturn(kNewAccessToken);
                                                     OCMStub([mockVerifyPasswordResponse
                                                                 approximateExpirationDate])
                                                         .andReturn(
                                                             [NSDate dateWithTimeIntervalSinceNow:
                                                                         kAccessTokenTimeToLive]);
                                                     OCMStub(
                                                         [mockVerifyPasswordResponse refreshToken])
                                                         .andReturn(kRefreshToken);
                                                     callback(mockVerifyPasswordResponse, nil);
                                                   });
                                                 });
                                             OCMExpect([self->_mockBackend
                                                           getAccountInfo:[OCMArg any]
                                                                 callback:[OCMArg any]])
                                                 .andCallBlock2(^(
                                                     FIRGetAccountInfoRequest *_Nullable request,
                                                     FIRGetAccountInfoResponseCallback callback) {
                                                   XCTAssertEqualObjects(request.APIKey, kAPIKey);
                                                   // Verify that the new access token is being used
                                                   // for subsequent requests.
                                                   XCTAssertEqualObjects(request.accessToken,
                                                                         kNewAccessToken);
                                                   dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
                                                     id mockGetAccountInfoResponse = OCMClassMock(
                                                         [FIRGetAccountInfoResponse class]);
                                                     OCMStub([mockGetAccountInfoResponse users])
                                                         .andReturn(
                                                             @[ mockGetAccountInfoResponseUser ]);
                                                     callback(mockGetAccountInfoResponse, nil);
                                                   });
                                                 });
                                             FIRAuthCredential *emailCredential =
                                                 [FIREmailAuthProvider
                                                     credentialWithEmail:kEmail
                                                                password:kFakePassword];
                                             [user
                                                 reauthenticateWithCredential:emailCredential
                                                                   completion:^(
                                                                       FIRAuthDataResult
                                                                           *_Nullable result,
                                                                       NSError *_Nullable error) {
                                                                     XCTAssertTrue(
                                                                         [NSThread isMainThread]);
                                                                     XCTAssertNil(error);
                                                                     // Verify that the current user
                                                                     // is unchanged.
                                                                     XCTAssertEqual(
                                                                         [FIRAuth auth].currentUser,
                                                                         user);
                                                                     [expectation fulfill];
                                                                   }];
                                           }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testReauthenticateWithCredentialSuccess
    @brief Tests the flow of a successful @c reauthenticateWithCredential:completion:
        call.
 */
- (void)testReauthenticateWithCredentialSuccess {
  [self expectVerifyAssertionRequest:FIRGoogleAuthProviderID
                         federatedID:kGoogleID
                         displayName:kGoogleDisplayName
                             profile:[[self class] googleProfile]
                     providerIDToken:kGoogleIDToken
                 providerAccessToken:kGoogleAccessToken];

  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [[FIRAuth auth] signOut:NULL];
  FIRAuthCredential *googleCredential =
      [FIRGoogleAuthProvider credentialWithIDToken:kGoogleIDToken accessToken:kGoogleAccessToken];
  [[FIRAuth auth]
      signInWithCredential:googleCredential
                completion:^(FIRAuthDataResult *_Nullable authResult, NSError *_Nullable error) {
                  XCTAssertTrue([NSThread isMainThread]);
                  [self assertUserGoogle:authResult.user];
                  XCTAssertEqualObjects(authResult.additionalUserInfo.profile,
                                        [[self class] googleProfile]);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.username, kUserName);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.providerID,
                                        FIRGoogleAuthProviderID);
                  XCTAssertNil(error);

                  [self expectVerifyAssertionRequest:FIRGoogleAuthProviderID
                                         federatedID:kGoogleID
                                         displayName:kGoogleDisplayName
                                             profile:[[self class] googleProfile]
                                     providerIDToken:kGoogleIDToken
                                 providerAccessToken:kGoogleAccessToken];

                  FIRAuthCredential *reauthenticateGoogleCredential =
                      [FIRGoogleAuthProvider credentialWithIDToken:kGoogleIDToken
                                                       accessToken:kGoogleAccessToken];
                  [authResult.user
                      reauthenticateWithCredential:reauthenticateGoogleCredential
                                        completion:^(
                                            FIRAuthDataResult *_Nullable reauthenticateAuthResult,
                                            NSError *_Nullable error) {
                                          XCTAssertTrue([NSThread isMainThread]);
                                          XCTAssertNil(error);
                                          // Verify that the current user is unchanged.
                                          XCTAssertEqual([FIRAuth auth].currentUser,
                                                         authResult.user);
                                          // Verify that the current user and reauthenticated user
                                          // are not same pointers.
                                          XCTAssertNotEqualObjects(authResult.user,
                                                                   reauthenticateAuthResult.user);
                                          // Verify that anyway the current user and reauthenticated
                                          // user have same IDs.
                                          XCTAssertEqualObjects(authResult.user.uid,
                                                                reauthenticateAuthResult.user.uid);
                                          XCTAssertEqualObjects(
                                              authResult.user.displayName,
                                              reauthenticateAuthResult.user.displayName);
                                          XCTAssertEqualObjects(
                                              reauthenticateAuthResult.additionalUserInfo.profile,
                                              [[self class] googleProfile]);
                                          XCTAssertEqualObjects(
                                              reauthenticateAuthResult.additionalUserInfo.username,
                                              kUserName);
                                          XCTAssertEqualObjects(reauthenticateAuthResult
                                                                    .additionalUserInfo.providerID,
                                                                FIRGoogleAuthProviderID);
                                          [expectation fulfill];
                                        }];
                }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  [self assertUserGoogle:[FIRAuth auth].currentUser];
  OCMVerifyAll(_mockBackend);
}

/** @fn testReauthenticateFailure
    @brief Tests the flow of a failed @c reauthenticateWithCredential:completion: call.
 */
- (void)testReauthenticateFailure {
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(kGoogleDisplayName);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self
      signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                           completion:^(FIRUser *user) {
                                             OCMExpect([self->_mockBackend
                                                           verifyPassword:[OCMArg any]
                                                                 callback:[OCMArg any]])
                                                 .andCallBlock2(^(
                                                     FIRVerifyPasswordRequest *_Nullable request,
                                                     FIRVerifyPasswordResponseCallback callback) {
                                                   dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
                                                     id mockVerifyPasswordResponse = OCMClassMock(
                                                         [FIRVerifyPasswordResponse class]);
                                                     OCMStub([mockVerifyPasswordResponse IDToken])
                                                         .andReturn(kNewAccessToken);
                                                     OCMStub([mockVerifyPasswordResponse
                                                                 approximateExpirationDate])
                                                         .andReturn(
                                                             [NSDate dateWithTimeIntervalSinceNow:
                                                                         kAccessTokenTimeToLive]);
                                                     OCMStub(
                                                         [mockVerifyPasswordResponse refreshToken])
                                                         .andReturn(kRefreshToken);
                                                     callback(mockVerifyPasswordResponse, nil);
                                                   });
                                                 });
                                             OCMExpect([self->_mockBackend
                                                           getAccountInfo:[OCMArg any]
                                                                 callback:[OCMArg any]])
                                                 .andCallBlock2(^(
                                                     FIRGetAccountInfoRequest *_Nullable request,
                                                     FIRGetAccountInfoResponseCallback callback) {
                                                   dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
                                                     id mockGetAccountInfoResponseUserNew =
                                                         OCMClassMock(
                                                             [FIRGetAccountInfoResponseUser class]);
                                                     // The newly-signed-in user has a different ID.
                                                     OCMStub([mockGetAccountInfoResponseUserNew
                                                                 localID])
                                                         .andReturn(kAnotherLocalID);
                                                     OCMStub(
                                                         [mockGetAccountInfoResponseUserNew email])
                                                         .andReturn(kNewEmail);
                                                     OCMStub([mockGetAccountInfoResponseUserNew
                                                                 displayName])
                                                         .andReturn(kNewDisplayName);
                                                     OCMStub([mockGetAccountInfoResponseUserNew
                                                                 passwordHash])
                                                         .andReturn(kPasswordHash);
                                                     id mockGetAccountInfoResponse = OCMClassMock(
                                                         [FIRGetAccountInfoResponse class]);
                                                     OCMStub([mockGetAccountInfoResponse users])
                                                         .andReturn(@[
                                                           mockGetAccountInfoResponseUserNew
                                                         ]);
                                                     callback(mockGetAccountInfoResponse, nil);
                                                   });
                                                 });
                                             FIRAuthCredential *emailCredential =
                                                 [FIREmailAuthProvider
                                                     credentialWithEmail:kEmail
                                                                password:kFakePassword];
                                             [user
                                                 reauthenticateWithCredential:emailCredential
                                                                   completion:^(
                                                                       FIRAuthDataResult
                                                                           *_Nullable result,
                                                                       NSError *_Nullable error) {
                                                                     XCTAssertTrue(
                                                                         [NSThread isMainThread]);
                                                                     // Verify user mismatch error.
                                                                     XCTAssertEqual(
                                                                         error.code,
                                                                         FIRAuthErrorCodeUserMismatch);
                                                                     // Verify that the current user
                                                                     // is unchanged.
                                                                     XCTAssertEqual(
                                                                         [FIRAuth auth].currentUser,
                                                                         user);
                                                                     [expectation fulfill];
                                                                   }];
                                           }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testReauthenticateUserMismatchFailure
    @brief Tests the flow of a failed @c reauthenticateWithCredential:completion: call due to trying
        to reauthenticate a user that does not exist.
 */
- (void)testReauthenticateUserMismatchFailure {
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(kGoogleDisplayName);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self
      signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                           completion:^(FIRUser *user) {
                                             OCMExpect([self->_mockBackend
                                                           verifyAssertion:[OCMArg any]
                                                                  callback:[OCMArg any]])
                                                 .andCallBlock2(^(
                                                     FIRVerifyAssertionRequest *_Nullable request,
                                                     FIRVerifyAssertionResponseCallback callback) {
                                                   dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
                                                     callback(
                                                         nil,
                                                         [FIRAuthErrorUtils
                                                             userNotFoundErrorWithMessage:nil]);
                                                   });
                                                 });
                                             FIRAuthCredential *googleCredential =
                                                 [FIRGoogleAuthProvider
                                                     credentialWithIDToken:kGoogleIDToken
                                                               accessToken:kGoogleAccessToken];
                                             [user
                                                 reauthenticateWithCredential:googleCredential
                                                                   completion:^(
                                                                       FIRAuthDataResult
                                                                           *_Nullable result,
                                                                       NSError *_Nullable error) {
                                                                     XCTAssertTrue(
                                                                         [NSThread isMainThread]);
                                                                     // Verify user mismatch error.
                                                                     XCTAssertEqual(
                                                                         error.code,
                                                                         FIRAuthErrorCodeUserMismatch);
                                                                     // Verify that the current user
                                                                     // is unchanged.
                                                                     XCTAssertEqual(
                                                                         [FIRAuth auth].currentUser,
                                                                         user);
                                                                     [expectation fulfill];
                                                                   }];
                                           }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testlinkAndRetrieveDataSuccess
    @brief Tests the flow of a successful @c linkWithCredential:completion:
        call.
 */
- (void)testlinkAndRetrieveDataSuccess {
  [self expectVerifyAssertionRequest:FIRFacebookAuthProviderID
                         federatedID:kFacebookID
                         displayName:kFacebookDisplayName
                             profile:[[self class] googleProfile]
                     providerIDToken:kFacebookIDToken
                 providerAccessToken:kFacebookAccessToken];

  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [[FIRAuth auth] signOut:NULL];
  FIRAuthCredential *facebookCredential =
      [FIRFacebookAuthProvider credentialWithAccessToken:kFacebookAccessToken];
  [[FIRAuth auth]
      signInWithCredential:facebookCredential
                completion:^(FIRAuthDataResult *_Nullable authResult, NSError *_Nullable error) {
                  XCTAssertTrue([NSThread isMainThread]);
                  [self assertUserFacebook:authResult.user];
                  XCTAssertEqualObjects(authResult.additionalUserInfo.profile,
                                        [[self class] googleProfile]);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.username, kUserName);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.providerID,
                                        FIRFacebookAuthProviderID);
                  XCTAssertNil(error);

                  [self expectVerifyAssertionRequest:FIRGoogleAuthProviderID
                                         federatedID:kGoogleID
                                         displayName:kGoogleDisplayName
                                             profile:[[self class] googleProfile]
                                     providerIDToken:kGoogleIDToken
                                 providerAccessToken:kGoogleAccessToken];

                  FIRAuthCredential *linkGoogleCredential =
                      [FIRGoogleAuthProvider credentialWithIDToken:kGoogleIDToken
                                                       accessToken:kGoogleAccessToken];
                  [authResult.user
                      linkWithCredential:linkGoogleCredential
                              completion:^(FIRAuthDataResult *_Nullable linkAuthResult,
                                           NSError *_Nullable error) {
                                XCTAssertTrue([NSThread isMainThread]);
                                XCTAssertNil(error);
                                // Verify that the current user is unchanged.
                                XCTAssertEqual([FIRAuth auth].currentUser, authResult.user);
                                // Verify that the current user and reauthenticated user are same
                                // pointers.
                                XCTAssertEqualObjects(authResult.user, linkAuthResult.user);
                                // Verify that anyway the current user and linked user have same
                                // IDs.
                                XCTAssertEqualObjects(authResult.user.uid, linkAuthResult.user.uid);
                                XCTAssertEqualObjects(authResult.user.displayName,
                                                      linkAuthResult.user.displayName);
                                XCTAssertEqualObjects(linkAuthResult.additionalUserInfo.profile,
                                                      [[self class] googleProfile]);
                                XCTAssertEqualObjects(linkAuthResult.additionalUserInfo.username,
                                                      kUserName);
                                XCTAssertEqualObjects(linkAuthResult.additionalUserInfo.providerID,
                                                      FIRGoogleAuthProviderID);
                                [expectation fulfill];
                              }];
                }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  [self assertUserGoogle:[FIRAuth auth].currentUser];
  OCMVerifyAll(_mockBackend);
}

/** @fn testlinkAndRetrieveDataError
    @brief Tests the flow of an unsuccessful @c linkWithCredential:completion:
        call with an error from the backend.
 */
- (void)testlinkAndRetrieveDataError {
  [self expectVerifyAssertionRequest:FIRFacebookAuthProviderID
                         federatedID:kFacebookID
                         displayName:kFacebookDisplayName
                             profile:[[self class] googleProfile]
                     providerIDToken:kFacebookIDToken
                 providerAccessToken:kFacebookAccessToken];
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [[FIRAuth auth] signOut:NULL];
  FIRAuthCredential *facebookCredential =
      [FIRFacebookAuthProvider credentialWithAccessToken:kFacebookAccessToken];
  [[FIRAuth auth]
      signInWithCredential:facebookCredential
                completion:^(FIRAuthDataResult *_Nullable authResult, NSError *_Nullable error) {
                  XCTAssertTrue([NSThread isMainThread]);
                  [self assertUserFacebook:authResult.user];
                  XCTAssertEqualObjects(authResult.additionalUserInfo.profile,
                                        [[self class] googleProfile]);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.username, kUserName);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.providerID,
                                        FIRFacebookAuthProviderID);
                  XCTAssertNil(error);

                  OCMExpect([self->_mockBackend verifyAssertion:[OCMArg any] callback:[OCMArg any]])
                      .andCallBlock2(^(FIRVerifyAssertionRequest *_Nullable request,
                                       FIRVerifyAssertionResponseCallback callback) {
                        dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
                          callback(nil,
                                   [FIRAuthErrorUtils
                                       accountExistsWithDifferentCredentialErrorWithEmail:kEmail
                                                                        updatedCredential:nil]);
                        });
                      });

                  FIRAuthCredential *linkGoogleCredential =
                      [FIRGoogleAuthProvider credentialWithIDToken:kGoogleIDToken
                                                       accessToken:kGoogleAccessToken];
                  [authResult.user
                      linkWithCredential:linkGoogleCredential
                              completion:^(FIRAuthDataResult *_Nullable linkAuthResult,
                                           NSError *_Nullable error) {
                                XCTAssertTrue([NSThread isMainThread]);
                                XCTAssertNil(linkAuthResult);
                                XCTAssertEqual(
                                    error.code,
                                    FIRAuthErrorCodeAccountExistsWithDifferentCredential);
                                XCTAssertEqual(error.userInfo[FIRAuthErrorUserInfoEmailKey],
                                               kEmail);
                                XCTAssertEqual([FIRAuth auth].currentUser, authResult.user);
                                [expectation fulfill];
                              }];
                }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testlinkAndRetrieveDataProviderAlreadyLinked
    @brief Tests the flow of an unsuccessful @c linkWithCredential:completion:
        call with FIRAuthErrorCodeProviderAlreadyLinked, which is a client side error.
 */
- (void)testlinkAndRetrieveDataProviderAlreadyLinked {
  [self expectVerifyAssertionRequest:FIRFacebookAuthProviderID
                         federatedID:kFacebookID
                         displayName:kFacebookDisplayName
                             profile:[[self class] googleProfile]
                     providerIDToken:kFacebookIDToken
                 providerAccessToken:kFacebookAccessToken];
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [[FIRAuth auth] signOut:NULL];
  FIRAuthCredential *facebookCredential =
      [FIRFacebookAuthProvider credentialWithAccessToken:kFacebookAccessToken];
  [[FIRAuth auth]
      signInWithCredential:facebookCredential
                completion:^(FIRAuthDataResult *_Nullable authResult, NSError *_Nullable error) {
                  XCTAssertTrue([NSThread isMainThread]);
                  [self assertUserFacebook:authResult.user];
                  XCTAssertEqualObjects(authResult.additionalUserInfo.profile,
                                        [[self class] googleProfile]);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.username, kUserName);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.providerID,
                                        FIRFacebookAuthProviderID);
                  XCTAssertNil(error);

                  FIRAuthCredential *linkFacebookCredential =
                      [FIRFacebookAuthProvider credentialWithAccessToken:kFacebookAccessToken];
                  [authResult.user
                      linkWithCredential:linkFacebookCredential
                              completion:^(FIRAuthDataResult *_Nullable linkAuthResult,
                                           NSError *_Nullable error) {
                                XCTAssertTrue([NSThread isMainThread]);
                                XCTAssertNil(linkAuthResult);
                                XCTAssertEqual(error.code, FIRAuthErrorCodeProviderAlreadyLinked);
                                XCTAssertEqual([FIRAuth auth].currentUser, authResult.user);
                                [expectation fulfill];
                              }];
                }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testlinkAndRetrieveDataErrorAutoSignOut
    @brief Tests the flow of an unsuccessful @c linkWithCredential:completion:
        call that automatically signs out.
 */
- (void)testlinkAndRetrieveDataErrorAutoSignOut {
  [self expectVerifyAssertionRequest:FIRFacebookAuthProviderID
                         federatedID:kFacebookID
                         displayName:kFacebookDisplayName
                             profile:[[self class] googleProfile]
                     providerIDToken:kFacebookIDToken
                 providerAccessToken:kFacebookAccessToken];
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [[FIRAuth auth] signOut:NULL];
  FIRAuthCredential *facebookCredential =
      [FIRFacebookAuthProvider credentialWithAccessToken:kFacebookAccessToken];
  [[FIRAuth auth]
      signInWithCredential:facebookCredential
                completion:^(FIRAuthDataResult *_Nullable authResult, NSError *_Nullable error) {
                  XCTAssertTrue([NSThread isMainThread]);
                  [self assertUserFacebook:authResult.user];
                  XCTAssertEqualObjects(authResult.additionalUserInfo.profile,
                                        [[self class] googleProfile]);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.username, kUserName);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.providerID,
                                        FIRFacebookAuthProviderID);
                  XCTAssertNil(error);

                  OCMExpect([self->_mockBackend verifyAssertion:[OCMArg any] callback:[OCMArg any]])
                      .andCallBlock2(^(FIRVerifyAssertionRequest *_Nullable request,
                                       FIRVerifyAssertionResponseCallback callback) {
                        dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
                          callback(nil, [FIRAuthErrorUtils userDisabledErrorWithMessage:nil]);
                        });
                      });

                  FIRAuthCredential *linkGoogleCredential =
                      [FIRGoogleAuthProvider credentialWithIDToken:kGoogleIDToken
                                                       accessToken:kGoogleAccessToken];
                  [authResult.user
                      linkWithCredential:linkGoogleCredential
                              completion:^(FIRAuthDataResult *_Nullable linkAuthResult,
                                           NSError *_Nullable error) {
                                XCTAssertTrue([NSThread isMainThread]);
                                XCTAssertNil(linkAuthResult);
                                XCTAssertEqual(error.code, FIRAuthErrorCodeUserDisabled);
                                XCTAssertNil([FIRAuth auth].currentUser);
                                [expectation fulfill];
                              }];
                }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testlinkEmailAndRetrieveDataSuccess
    @brief Tests the flow of a successful @c linkWithCredential:completion:
        invocation for email credential.
 */
- (void)testlinkEmailAndRetrieveDataSuccess {
  [self expectVerifyAssertionRequest:FIRFacebookAuthProviderID
                         federatedID:kFacebookID
                         displayName:kFacebookDisplayName
                             profile:[[self class] googleProfile]
                     providerIDToken:kFacebookIDToken
                 providerAccessToken:kFacebookAccessToken];

  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [[FIRAuth auth] signOut:NULL];
  FIRAuthCredential *facebookCredential =
      [FIRFacebookAuthProvider credentialWithAccessToken:kFacebookAccessToken];
  [[FIRAuth auth]
      signInWithCredential:facebookCredential
                completion:^(FIRAuthDataResult *_Nullable authResult, NSError *_Nullable error) {
                  XCTAssertTrue([NSThread isMainThread]);
                  [self assertUserFacebook:authResult.user];
                  XCTAssertEqualObjects(authResult.additionalUserInfo.profile,
                                        [[self class] googleProfile]);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.username, kUserName);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.providerID,
                                        FIRFacebookAuthProviderID);
                  XCTAssertNil(error);

                  id mockGetAccountInfoResponseUser =
                      OCMClassMock([FIRGetAccountInfoResponseUser class]);
                  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
                  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
                  OCMStub([mockGetAccountInfoResponseUser displayName])
                      .andReturn(kEmailDisplayName);
                  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
                  // Get account info is expected to be invoked twice.
                  [self
                      expectGetAccountInfoWithMockUserInfoResponse:mockGetAccountInfoResponseUser];
                  [self
                      expectGetAccountInfoWithMockUserInfoResponse:mockGetAccountInfoResponseUser];

                  OCMExpect([self->_mockBackend setAccountInfo:[OCMArg any] callback:[OCMArg any]])
                      .andCallBlock2(^(FIRSetAccountInfoRequest *_Nullable request,
                                       FIRSetAccountInfoResponseCallback callback) {
                        XCTAssertEqualObjects(request.APIKey, kAPIKey);
                        XCTAssertEqualObjects(request.accessToken, kAccessToken);
                        XCTAssertEqualObjects(request.password, kFakePassword);
                        XCTAssertNil(request.localID);
                        XCTAssertNil(request.displayName);
                        dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
                          id mockSetAccountInfoResponse =
                              OCMClassMock([FIRSetAccountInfoResponse class]);
                          callback(mockSetAccountInfoResponse, nil);
                        });
                      });

                  FIRAuthCredential *linkEmailCredential =
                      [FIREmailAuthProvider credentialWithEmail:kEmail password:kFakePassword];
                  [authResult.user
                      linkWithCredential:linkEmailCredential
                              completion:^(FIRAuthDataResult *_Nullable linkAuthResult,
                                           NSError *_Nullable error) {
                                XCTAssertTrue([NSThread isMainThread]);
                                XCTAssertNil(error);
                                XCTAssertEqualObjects(linkAuthResult.user.email, kEmail);
                                XCTAssertEqualObjects(linkAuthResult.user.displayName,
                                                      kEmailDisplayName);
                                [expectation fulfill];
                              }];
                }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testlinkEmailProviderAlreadyLinkedError
    @brief Tests the flow of an unsuccessful @c linkWithCredential:completion:
        invocation for email credential and FIRAuthErrorCodeProviderAlreadyLinked which is a client
        side error.
 */
- (void)testlinkEmailProviderAlreadyLinkedError {
  [self expectVerifyAssertionRequest:FIRFacebookAuthProviderID
                         federatedID:kFacebookID
                         displayName:kFacebookDisplayName
                             profile:[[self class] googleProfile]
                     providerIDToken:kFacebookIDToken
                 providerAccessToken:kFacebookAccessToken];

  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [[FIRAuth auth] signOut:NULL];
  FIRAuthCredential *facebookCredential =
      [FIRFacebookAuthProvider credentialWithAccessToken:kFacebookAccessToken];
  [[FIRAuth auth]
      signInWithCredential:facebookCredential
                completion:^(FIRAuthDataResult *_Nullable authResult, NSError *_Nullable error) {
                  XCTAssertTrue([NSThread isMainThread]);
                  [self assertUserFacebook:authResult.user];
                  XCTAssertEqualObjects(authResult.additionalUserInfo.profile,
                                        [[self class] googleProfile]);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.username, kUserName);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.providerID,
                                        FIRFacebookAuthProviderID);
                  XCTAssertNil(error);

                  id mockGetAccountInfoResponseUser =
                      OCMClassMock([FIRGetAccountInfoResponseUser class]);
                  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
                  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
                  OCMStub([mockGetAccountInfoResponseUser displayName])
                      .andReturn(kEmailDisplayName);
                  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
                  // Get account info is expected to be invoked twice.
                  [self
                      expectGetAccountInfoWithMockUserInfoResponse:mockGetAccountInfoResponseUser];
                  [self
                      expectGetAccountInfoWithMockUserInfoResponse:mockGetAccountInfoResponseUser];

                  OCMExpect([self->_mockBackend setAccountInfo:[OCMArg any] callback:[OCMArg any]])
                      .andCallBlock2(^(FIRSetAccountInfoRequest *_Nullable request,
                                       FIRSetAccountInfoResponseCallback callback) {
                        XCTAssertEqualObjects(request.APIKey, kAPIKey);
                        XCTAssertEqualObjects(request.accessToken, kAccessToken);
                        XCTAssertEqualObjects(request.password, kFakePassword);
                        XCTAssertNil(request.localID);
                        XCTAssertNil(request.displayName);
                        dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
                          id mockSetAccountInfoResponse =
                              OCMClassMock([FIRSetAccountInfoResponse class]);
                          callback(mockSetAccountInfoResponse, nil);
                        });
                      });

                  FIRAuthCredential *linkEmailCredential =
                      [FIREmailAuthProvider credentialWithEmail:kEmail password:kFakePassword];
                  [authResult.user
                      linkWithCredential:linkEmailCredential
                              completion:^(FIRAuthDataResult *_Nullable linkAuthResult,
                                           NSError *_Nullable error) {
                                XCTAssertNil(error);
                                XCTAssertEqualObjects(linkAuthResult.user.email, kEmail);
                                XCTAssertEqualObjects(linkAuthResult.user.displayName,
                                                      kEmailDisplayName);

                                // Try linking same credential a second time to trigger client side
                                // error.
                                [authResult.user
                                    linkWithCredential:linkEmailCredential
                                            completion:^(
                                                FIRAuthDataResult *_Nullable linkAuthResult,
                                                NSError *_Nullable error) {
                                              XCTAssertTrue([NSThread isMainThread]);
                                              XCTAssertNil(linkAuthResult);
                                              XCTAssertEqual(error.code,
                                                             FIRAuthErrorCodeProviderAlreadyLinked);
                                              [expectation fulfill];
                                            }];
                              }];
                }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testlinkEmailAndRetrieveDataError
    @brief Tests the flow of an unsuccessful @c linkWithCredential:completion:
        invocation for email credential and an error from the backend.
 */
- (void)testlinkEmailAndRetrieveDataError {
  [self expectVerifyAssertionRequest:FIRFacebookAuthProviderID
                         federatedID:kFacebookID
                         displayName:kFacebookDisplayName
                             profile:[[self class] googleProfile]
                     providerIDToken:kFacebookIDToken
                 providerAccessToken:kFacebookAccessToken];

  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [[FIRAuth auth] signOut:NULL];
  FIRAuthCredential *facebookCredential =
      [FIRFacebookAuthProvider credentialWithAccessToken:kFacebookAccessToken];
  [[FIRAuth auth]
      signInWithCredential:facebookCredential
                completion:^(FIRAuthDataResult *_Nullable authResult, NSError *_Nullable error) {
                  XCTAssertTrue([NSThread isMainThread]);
                  [self assertUserFacebook:authResult.user];
                  XCTAssertEqualObjects(authResult.additionalUserInfo.profile,
                                        [[self class] googleProfile]);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.username, kUserName);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.providerID,
                                        FIRFacebookAuthProviderID);
                  XCTAssertNil(error);

                  OCMExpect([self->_mockBackend getAccountInfo:[OCMArg any] callback:[OCMArg any]])
                      .andCallBlock2(^(FIRGetAccountInfoRequest *_Nullable request,
                                       FIRGetAccountInfoResponseCallback callback) {
                        XCTAssertEqualObjects(request.APIKey, kAPIKey);
                        XCTAssertEqualObjects(request.accessToken, kAccessToken);
                        dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
                          callback(nil, [FIRAuthErrorUtils tooManyRequestsErrorWithMessage:nil]);
                        });
                      });

                  FIRAuthCredential *linkEmailCredential =
                      [FIREmailAuthProvider credentialWithEmail:kEmail password:kFakePassword];
                  [authResult.user
                      linkWithCredential:linkEmailCredential
                              completion:^(FIRAuthDataResult *_Nullable linkAuthResult,
                                           NSError *_Nullable error) {
                                XCTAssertTrue([NSThread isMainThread]);
                                XCTAssertNil(linkAuthResult);
                                XCTAssertEqual(error.code, FIRAuthErrorCodeTooManyRequests);
                                XCTAssertEqual([FIRAuth auth].currentUser, authResult.user);
                                [expectation fulfill];
                              }];
                }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testlinkEmailAndRetrieveDataError
    @brief Tests the flow of an unsuccessful @c linkWithCredential:completion:
        invocation that automatically signs out.
 */
- (void)testlinkEmailAndRetrieveDataErrorAutoSignOut {
  [self expectVerifyAssertionRequest:FIRFacebookAuthProviderID
                         federatedID:kFacebookID
                         displayName:kFacebookDisplayName
                             profile:[[self class] googleProfile]
                     providerIDToken:kFacebookIDToken
                 providerAccessToken:kFacebookAccessToken];

  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [[FIRAuth auth] signOut:NULL];
  FIRAuthCredential *facebookCredential =
      [FIRFacebookAuthProvider credentialWithAccessToken:kFacebookAccessToken];
  [[FIRAuth auth]
      signInWithCredential:facebookCredential
                completion:^(FIRAuthDataResult *_Nullable authResult, NSError *_Nullable error) {
                  XCTAssertTrue([NSThread isMainThread]);
                  [self assertUserFacebook:authResult.user];
                  XCTAssertEqualObjects(authResult.additionalUserInfo.profile,
                                        [[self class] googleProfile]);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.username, kUserName);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.providerID,
                                        FIRFacebookAuthProviderID);
                  XCTAssertNil(error);

                  OCMExpect([self->_mockBackend getAccountInfo:[OCMArg any] callback:[OCMArg any]])
                      .andCallBlock2(^(FIRGetAccountInfoRequest *_Nullable request,
                                       FIRGetAccountInfoResponseCallback callback) {
                        XCTAssertEqualObjects(request.APIKey, kAPIKey);
                        XCTAssertEqualObjects(request.accessToken, kAccessToken);
                        dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
                          callback(nil, [FIRAuthErrorUtils userTokenExpiredErrorWithMessage:nil]);
                        });
                      });

                  FIRAuthCredential *linkEmailCredential =
                      [FIREmailAuthProvider credentialWithEmail:kEmail password:kFakePassword];
                  [authResult.user
                      linkWithCredential:linkEmailCredential
                              completion:^(FIRAuthDataResult *_Nullable linkAuthResult,
                                           NSError *_Nullable error) {
                                XCTAssertTrue([NSThread isMainThread]);
                                XCTAssertNil(linkAuthResult);
                                XCTAssertEqual(error.code, FIRAuthErrorCodeUserTokenExpired);
                                XCTAssertNil([FIRAuth auth].currentUser);
                                [expectation fulfill];
                              }];
                }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testlinkCredentialSuccess
    @brief Tests the flow of a successful @c linkWithCredential:completion: call, without additional
        IDP data.
 */
- (void)testlinkCredentialSuccess {
  [self expectVerifyAssertionRequest:FIRFacebookAuthProviderID
                         federatedID:kFacebookID
                         displayName:kFacebookDisplayName
                             profile:[[self class] googleProfile]
                     providerIDToken:kFacebookIDToken
                 providerAccessToken:kFacebookAccessToken];

  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [[FIRAuth auth] signOut:NULL];
  FIRAuthCredential *facebookCredential =
      [FIRFacebookAuthProvider credentialWithAccessToken:kFacebookAccessToken];
  [[FIRAuth auth]
      signInWithCredential:facebookCredential
                completion:^(FIRAuthDataResult *_Nullable authResult, NSError *_Nullable error) {
                  XCTAssertTrue([NSThread isMainThread]);
                  [self assertUserFacebook:authResult.user];
                  XCTAssertEqualObjects(authResult.additionalUserInfo.profile,
                                        [[self class] googleProfile]);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.username, kUserName);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.providerID,
                                        FIRFacebookAuthProviderID);
                  XCTAssertNil(error);

                  [self expectVerifyAssertionRequest:FIRGoogleAuthProviderID
                                         federatedID:kGoogleID
                                         displayName:kGoogleDisplayName
                                             profile:[[self class] googleProfile]
                                     providerIDToken:kGoogleIDToken
                                 providerAccessToken:kGoogleAccessToken];

                  FIRAuthCredential *linkGoogleCredential =
                      [FIRGoogleAuthProvider credentialWithIDToken:kGoogleIDToken
                                                       accessToken:kGoogleAccessToken];
                  [authResult.user
                      linkWithCredential:linkGoogleCredential
                              completion:^(FIRAuthDataResult *_Nullable result,
                                           NSError *_Nullable error) {
                                XCTAssertNil(error);
                                id<FIRUserInfo> userInfo = result.user.providerData.firstObject;
                                XCTAssertEqual(userInfo.providerID, FIRGoogleAuthProviderID);
                                XCTAssertEqual([FIRAuth auth].currentUser, authResult.user);
                                [expectation fulfill];
                              }];
                }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  [self assertUserGoogle:[FIRAuth auth].currentUser];
  OCMVerifyAll(_mockBackend);
}

/** @fn testlinkCredentialError
    @brief Tests the flow of an unsuccessful @c linkWithCredential:completion: call, with an error
        from the backend.
 */
- (void)testlinkCredentialError {
  [self expectVerifyAssertionRequest:FIRFacebookAuthProviderID
                         federatedID:kFacebookID
                         displayName:kFacebookDisplayName
                             profile:[[self class] googleProfile]
                     providerIDToken:kFacebookIDToken
                 providerAccessToken:kFacebookAccessToken];

  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [[FIRAuth auth] signOut:NULL];
  FIRAuthCredential *facebookCredential =
      [FIRFacebookAuthProvider credentialWithAccessToken:kFacebookAccessToken];
  [[FIRAuth auth]
      signInWithCredential:facebookCredential
                completion:^(FIRAuthDataResult *_Nullable authResult, NSError *_Nullable error) {
                  XCTAssertTrue([NSThread isMainThread]);
                  [self assertUserFacebook:authResult.user];
                  XCTAssertEqualObjects(authResult.additionalUserInfo.profile,
                                        [[self class] googleProfile]);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.username, kUserName);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.providerID,
                                        FIRFacebookAuthProviderID);
                  XCTAssertNil(error);

                  OCMExpect([self->_mockBackend verifyAssertion:[OCMArg any] callback:[OCMArg any]])
                      .andCallBlock2(^(FIRVerifyAssertionRequest *_Nullable request,
                                       FIRVerifyAssertionResponseCallback callback) {
                        dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
                          callback(nil, [FIRAuthErrorUtils userDisabledErrorWithMessage:nil]);
                        });
                      });

                  FIRAuthCredential *linkGoogleCredential =
                      [FIRGoogleAuthProvider credentialWithIDToken:kGoogleIDToken
                                                       accessToken:kGoogleAccessToken];
                  [authResult.user
                      linkWithCredential:linkGoogleCredential
                              completion:^(FIRAuthDataResult *_Nullable result,
                                           NSError *_Nullable error) {
                                XCTAssertNil(result.user);
                                XCTAssertEqual(error.code, FIRAuthErrorCodeUserDisabled);
                                [expectation fulfill];
                              }];
                }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testlinkCredentialProviderAlreadyLinkedError
    @brief Tests the flow of an unsuccessful @c linkWithCredential:completion: call, with a client
        side error.
 */
- (void)testlinkCredentialProviderAlreadyLinkedError {
  [self expectVerifyAssertionRequest:FIRFacebookAuthProviderID
                         federatedID:kFacebookID
                         displayName:kFacebookDisplayName
                             profile:[[self class] googleProfile]
                     providerIDToken:kFacebookIDToken
                 providerAccessToken:kFacebookAccessToken];

  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [[FIRAuth auth] signOut:NULL];
  FIRAuthCredential *facebookCredential =
      [FIRFacebookAuthProvider credentialWithAccessToken:kFacebookAccessToken];
  [[FIRAuth auth]
      signInWithCredential:facebookCredential
                completion:^(FIRAuthDataResult *_Nullable authResult, NSError *_Nullable error) {
                  XCTAssertTrue([NSThread isMainThread]);
                  [self assertUserFacebook:authResult.user];
                  XCTAssertEqualObjects(authResult.additionalUserInfo.profile,
                                        [[self class] googleProfile]);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.username, kUserName);
                  XCTAssertEqualObjects(authResult.additionalUserInfo.providerID,
                                        FIRFacebookAuthProviderID);
                  XCTAssertNil(error);

                  FIRAuthCredential *linkFacebookCredential =
                      [FIRFacebookAuthProvider credentialWithAccessToken:kGoogleAccessToken];
                  [authResult.user
                      linkWithCredential:linkFacebookCredential
                              completion:^(FIRAuthDataResult *_Nullable result,
                                           NSError *_Nullable error) {
                                XCTAssertNil(result.user);
                                XCTAssertEqual(error.code, FIRAuthErrorCodeProviderAlreadyLinked);
                                [expectation fulfill];
                              }];
                }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

#if TARGET_OS_IOS
/** @fn testlinkPhoneAuthCredentialSuccess
    @brief Tests the flow of a successful @c linkWithCredential:completion:
        call using a phoneAuthCredential.
 */
- (void)testlinkPhoneAuthCredentialSuccess {
  id (^mockUserInfoWithPhoneNumber)(NSString *) = ^(NSString *phoneNumber) {
    id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
    OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
    OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
    OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
    if (phoneNumber.length) {
      NSDictionary *userInfoDictionary = @{@"providerId" : FIRPhoneAuthProviderID};
      FIRGetAccountInfoResponseProviderUserInfo *userInfo =
          [[FIRGetAccountInfoResponseProviderUserInfo alloc] initWithDictionary:userInfoDictionary];
      OCMStub([mockGetAccountInfoResponseUser providerUserInfo]).andReturn(@[ userInfo ]);
      OCMStub([mockGetAccountInfoResponseUser phoneNumber]).andReturn(phoneNumber);
    }
    return mockGetAccountInfoResponseUser;
  };

  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  id userInfoResponse = mockUserInfoWithPhoneNumber(nil);
  [self
      signInWithEmailPasswordWithMockUserInfoResponse:userInfoResponse
                                           completion:^(FIRUser *user) {
                                             [self
                                                 expectVerifyPhoneNumberRequestWithPhoneNumber:
                                                     kPhoneNumber
                                                                               isLinkOperation:YES
                                                                                         error:nil];
                                             id userInfoResponseUpdate =
                                                 mockUserInfoWithPhoneNumber(kPhoneNumber);
                                             [self expectGetAccountInfoWithMockUserInfoResponse:
                                                       userInfoResponseUpdate];

                                             FIRPhoneAuthCredential *credential =
                                                 [[FIRPhoneAuthProvider provider]
                                                     credentialWithVerificationID:kVerificationID
                                                                 verificationCode:
                                                                     kVerificationCode];
                                             [user
                                                 linkWithCredential:credential
                                                         completion:^(FIRAuthDataResult
                                                                          *_Nullable linkAuthResult,
                                                                      NSError *_Nullable error) {
                                                           XCTAssertNil(error);
                                                           XCTAssertEqualObjects(
                                                               [FIRAuth auth]
                                                                   .currentUser.providerData
                                                                   .firstObject.providerID,
                                                               FIRPhoneAuthProviderID);
                                                           XCTAssertEqualObjects(
                                                               [FIRAuth auth]
                                                                   .currentUser.phoneNumber,
                                                               kPhoneNumber);
                                                           [expectation fulfill];
                                                         }];
                                           }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testUnlinkPhoneAuthCredentialSuccess
    @brief Tests the flow of a successful @c unlinkFromProvider:completion: call using a
        @c FIRPhoneAuthProvider.
 */
- (void)testUnlinkPhoneAuthCredentialSuccess {
  id (^mockUserInfoWithPhoneNumber)(NSString *) = ^(NSString *phoneNumber) {
    id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
    OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
    OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
    OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
    if (phoneNumber.length) {
      NSDictionary *userInfoDictionary = @{@"providerId" : FIRPhoneAuthProviderID};
      FIRGetAccountInfoResponseProviderUserInfo *userInfo =
          [[FIRGetAccountInfoResponseProviderUserInfo alloc] initWithDictionary:userInfoDictionary];
      OCMStub([mockGetAccountInfoResponseUser providerUserInfo]).andReturn(@[ userInfo ]);
      OCMStub([mockGetAccountInfoResponseUser phoneNumber]).andReturn(phoneNumber);
    }
    return mockGetAccountInfoResponseUser;
  };

  OCMExpect([self->_mockBackend setAccountInfo:[OCMArg any] callback:[OCMArg any]])
      .andCallBlock2(^(FIRSetAccountInfoRequest *_Nullable request,
                       FIRSetAccountInfoResponseCallback callback) {
        XCTAssertEqualObjects(request.APIKey, kAPIKey);
        XCTAssertEqualObjects(request.accessToken, kAccessToken);
        XCTAssertNotNil(request.deleteProviders);
        XCTAssertNil(request.email);
        XCTAssertNil(request.localID);
        XCTAssertNil(request.displayName);
        XCTAssertNil(request.photoURL);
        XCTAssertNil(request.password);
        XCTAssertNil(request.providers);
        XCTAssertNil(request.deleteAttributes);
        dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
          id mockSetAccountInfoResponse = OCMClassMock([FIRSetAccountInfoResponse class]);
          callback(mockSetAccountInfoResponse, nil);
        });
      });
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  id userInfoResponse = mockUserInfoWithPhoneNumber(nil);
  [self
      signInWithEmailPasswordWithMockUserInfoResponse:userInfoResponse
                                           completion:^(FIRUser *user) {
                                             [self
                                                 expectVerifyPhoneNumberRequestWithPhoneNumber:
                                                     kPhoneNumber
                                                                               isLinkOperation:YES
                                                                                         error:nil];
                                             id userInfoResponseUpdate =
                                                 mockUserInfoWithPhoneNumber(kPhoneNumber);
                                             [self expectGetAccountInfoWithMockUserInfoResponse:
                                                       userInfoResponseUpdate];

                                             FIRPhoneAuthCredential *credential =
                                                 [[FIRPhoneAuthProvider provider]
                                                     credentialWithVerificationID:kVerificationID
                                                                 verificationCode:
                                                                     kVerificationCode];
                                             // Link phone credential.
                                             [user
                                                 linkWithCredential:credential
                                                         completion:^(FIRAuthDataResult
                                                                          *_Nullable linkAuthResult,
                                                                      NSError *_Nullable error) {
                                                           XCTAssertNil(error);
                                                           XCTAssertEqualObjects(
                                                               [FIRAuth auth]
                                                                   .currentUser.providerData
                                                                   .firstObject.providerID,
                                                               FIRPhoneAuthProviderID);
                                                           XCTAssertEqualObjects(
                                                               [FIRAuth auth]
                                                                   .currentUser.phoneNumber,
                                                               kPhoneNumber);
                                                           // Immediately unlink the phone auth
                                                           // provider.
                                                           [user
                                                               unlinkFromProvider:
                                                                   FIRPhoneAuthProviderID
                                                                       completion:^(
                                                                           FIRUser *_Nullable user,
                                                                           NSError
                                                                               *_Nullable error) {
                                                                         XCTAssertNil(error);
                                                                         XCTAssertNil(
                                                                             [FIRAuth auth]
                                                                                 .currentUser
                                                                                 .phoneNumber);
                                                                         [expectation fulfill];
                                                                       }];
                                                         }];
                                           }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testlinkPhoneAuthCredentialFailure
    @brief Tests the flow of a failed call to @c linkWithCredential:completion: due
        to a phone provider already being linked.
 */
- (void)testlinkPhoneAuthCredentialFailure {
  id (^mockUserInfoWithPhoneNumber)(NSString *) = ^(NSString *phoneNumber) {
    id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
    OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
    OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
    OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
    if (phoneNumber.length) {
      OCMStub([mockGetAccountInfoResponseUser phoneNumber]).andReturn(phoneNumber);
    }
    return mockGetAccountInfoResponseUser;
  };

  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  id userInfoResponse = mockUserInfoWithPhoneNumber(nil);
  [self
      signInWithEmailPasswordWithMockUserInfoResponse:userInfoResponse
                                           completion:^(FIRUser *user) {
                                             NSError *error =
                                                 [FIRAuthErrorUtils providerAlreadyLinkedError];
                                             [self
                                                 expectVerifyPhoneNumberRequestWithPhoneNumber:nil
                                                                               isLinkOperation:YES
                                                                                         error:
                                                                                             error];
                                             FIRPhoneAuthCredential *credential =
                                                 [[FIRPhoneAuthProvider provider]
                                                     credentialWithVerificationID:kVerificationID
                                                                 verificationCode:
                                                                     kVerificationCode];
                                             [user
                                                 linkWithCredential:credential
                                                         completion:^(FIRAuthDataResult
                                                                          *_Nullable linkAuthResult,
                                                                      NSError *_Nullable error) {
                                                           XCTAssertEqual(
                                                               error.code,
                                                               FIRAuthErrorCodeProviderAlreadyLinked);
                                                           [expectation fulfill];
                                                         }];
                                           }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn testlinkPhoneCredentialAlreadyExistsError
    @brief Tests the flow of @c linkWithCredential:completion:
        call using a phoneAuthCredential and a credential already exisits error. In this case we
        should get a FIRAuthCredential in the error object.
 */
- (void)testlinkPhoneCredentialAlreadyExistsError {
  id (^mockUserInfoWithPhoneNumber)(NSString *) = ^(NSString *phoneNumber) {
    id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
    OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
    OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
    OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
    if (phoneNumber.length) {
      OCMStub([mockGetAccountInfoResponseUser phoneNumber]).andReturn(phoneNumber);
    }
    return mockGetAccountInfoResponseUser;
  };

  void (^expectVerifyPhoneNumberRequest)(NSString *) = ^(NSString *phoneNumber) {
    OCMExpect([self->_mockBackend verifyPhoneNumber:[OCMArg any] callback:[OCMArg any]])
        .andCallBlock2(^(FIRVerifyPhoneNumberRequest *_Nullable request,
                         FIRVerifyPhoneNumberResponseCallback callback) {
          XCTAssertEqualObjects(request.verificationID, kVerificationID);
          XCTAssertEqualObjects(request.verificationCode, kVerificationCode);
          XCTAssertEqualObjects(request.accessToken, kAccessToken);
          dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
            FIRPhoneAuthCredential *credential =
                [[FIRPhoneAuthCredential alloc] initWithTemporaryProof:kTemporaryProof
                                                           phoneNumber:kPhoneNumber
                                                            providerID:FIRPhoneAuthProviderID];
            callback(nil, [FIRAuthErrorUtils credentialAlreadyInUseErrorWithMessage:nil
                                                                         credential:credential
                                                                              email:nil]);
          });
        });
  };

  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  id userInfoResponse = mockUserInfoWithPhoneNumber(nil);
  [self
      signInWithEmailPasswordWithMockUserInfoResponse:userInfoResponse
                                           completion:^(FIRUser *user) {
                                             expectVerifyPhoneNumberRequest(kPhoneNumber);

                                             FIRPhoneAuthCredential *credential =
                                                 [[FIRPhoneAuthProvider provider]
                                                     credentialWithVerificationID:kVerificationID
                                                                 verificationCode:
                                                                     kVerificationCode];
                                             [user
                                                 linkWithCredential:credential
                                                         completion:^(FIRAuthDataResult
                                                                          *_Nullable linkAuthResult,
                                                                      NSError *_Nullable error) {
                                                           XCTAssertNil(linkAuthResult);
                                                           XCTAssertEqual(
                                                               error.code,
                                                               FIRAuthErrorCodeCredentialAlreadyInUse);
                                                           FIRPhoneAuthCredential *credential =
                                                               error.userInfo
                                                                   [FIRAuthErrorUserInfoUpdatedCredentialKey];
                                                           XCTAssertEqual(credential.temporaryProof,
                                                                          kTemporaryProof);
                                                           XCTAssertEqual(credential.phoneNumber,
                                                                          kPhoneNumber);
                                                           [expectation fulfill];
                                                         }];
                                           }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}
#endif

#pragma mark - FIRCustomTokenProviderDelegate

- (void)getCustomTokenWithCompletion:(void (^)(NSString *_Nullable customToken,
                                               NSError *_Nullable error))completion {
  completion(kCustomToken, nil);
}

#pragma mark - Helpers

/** @fn getIDTokenResultForcingRefreshSuccess
    @brief Helper for testing the flow of a successful @c
        getIDTokenResultForcingRefresh:completion: call.
 */
- (void)getIDTokenResultForcingRefreshSuccessWithIDToken:(NSString *)IDToken {
  id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
  OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
  OCMStub([mockGetAccountInfoResponseUser email]).andReturn(kEmail);
  OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(kGoogleDisplayName);
  OCMStub([mockGetAccountInfoResponseUser passwordHash]).andReturn(kPasswordHash);
  XCTestExpectation *expectation = [self expectationWithDescription:@"callback"];
  [self
      signInWithEmailPasswordWithMockUserInfoResponse:mockGetAccountInfoResponseUser
                                           completion:^(FIRUser *user) {
                                             OCMExpect([self->_mockBackend
                                                           secureToken:[OCMArg any]
                                                              callback:[OCMArg any]])
                                                 .andCallBlock2(^(
                                                     FIRSecureTokenRequest *_Nullable request,
                                                     FIRSecureTokenResponseCallback callback) {
                                                   XCTAssertEqualObjects(request.APIKey, kAPIKey);

                                                   dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
                                                     id mockSecureTokenResponse = OCMClassMock(
                                                         [FIRSecureTokenResponse class]);
                                                     OCMStub([mockSecureTokenResponse accessToken])
                                                         .andReturn(IDToken);
                                                     callback(mockSecureTokenResponse, nil);
                                                   });
                                                 });
                                             [user
                                                 getIDTokenResultForcingRefresh:YES
                                                                     completion:^(
                                                                         FIRAuthTokenResult
                                                                             *_Nullable tokenResult,
                                                                         NSError *_Nullable error) {
                                                                       XCTAssertTrue(
                                                                           [NSThread isMainThread]);
                                                                       XCTAssertNil(error);
                                                                       XCTAssertEqualObjects(
                                                                           tokenResult.token,
                                                                           IDToken);
                                                                       XCTAssertTrue(
                                                                           tokenResult
                                                                               .issuedAtDate &&
                                                                           [tokenResult.issuedAtDate
                                                                               isKindOfClass:
                                                                                   [NSDate class]]);
                                                                       XCTAssertTrue(
                                                                           tokenResult.authDate &&
                                                                           [tokenResult.authDate
                                                                               isKindOfClass:
                                                                                   [NSDate class]]);
                                                                       XCTAssertTrue(
                                                                           tokenResult
                                                                               .expirationDate &&
                                                                           [tokenResult
                                                                                   .expirationDate
                                                                               isKindOfClass:
                                                                                   [NSDate class]]);
                                                                       XCTAssertTrue(
                                                                           tokenResult.claims &&
                                                                           [tokenResult.claims
                                                                               isKindOfClass:
                                                                                   [NSDictionary
                                                                                       class]]);
                                                                       [expectation fulfill];
                                                                     }];
                                           }];
  [self waitForExpectationsWithTimeout:kExpectationTimeout handler:nil];
  OCMVerifyAll(_mockBackend);
}

/** @fn signInAnonymouslyWithMockGetAccountInfoResponse:completion:
    @brief Signs in with an anonymous account with mocked backend end calls.
    @param mockUserInfoResponse A mocked FIRGetAccountInfoResponseUser object.
    @param completion The completion block that takes the newly signed-in user as the only
        parameter.
 */
- (void)signInAnonymouslyWithMockGetAccountInfoResponse:(id)mockUserInfoResponse
                                             completion:(void (^)(FIRUser *user))completion {
  OCMExpect([_mockBackend signUpNewUser:[OCMArg any] callback:[OCMArg any]])
      .andCallBlock2(
          ^(FIRSignUpNewUserRequest *_Nullable request, FIRSignupNewUserCallback callback) {
            id mockSignUpResponse = OCMClassMock([FIRSignUpNewUserResponse class]);
            OCMStub([mockSignUpResponse IDToken]).andReturn(kAccessToken);
            OCMStub([mockSignUpResponse approximateExpirationDate])
                .andReturn([NSDate dateWithTimeIntervalSinceNow:kAccessTokenTimeToLive]);
            OCMStub([mockSignUpResponse refreshToken]).andReturn(kRefreshToken);
            callback(mockSignUpResponse, nil);
          });
  [self expectGetAccountInfoWithMockUserInfoResponse:mockUserInfoResponse];
  [[FIRAuth auth] signOut:NULL];
  [[FIRAuth auth] signInAnonymouslyWithCompletion:^(FIRAuthDataResult *_Nullable result,
                                                    NSError *_Nullable error) {
    XCTAssertNotNil(result.user);
    XCTAssertNil(error);
    completion(result.user);
  }];
}

/** @fn signInWithEmailPasswordWithMockGetAccountInfoResponse:completion:
    @brief Signs in with an email and password account with mocked backend end calls.
    @param mockUserInfoResponse A mocked FIRGetAccountInfoResponseUser object.
    @param completion The completion block that takes the newly signed-in user as the only
        parameter.
 */
- (void)signInWithEmailPasswordWithMockUserInfoResponse:(id)mockUserInfoResponse
                                             completion:(void (^)(FIRUser *user))completion {
  OCMExpect([_mockBackend verifyPassword:[OCMArg any] callback:[OCMArg any]])
      .andCallBlock2(^(FIRVerifyPasswordRequest *_Nullable request,
                       FIRVerifyPasswordResponseCallback callback) {
        dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
          id mockVerifyPasswordResponse = OCMClassMock([FIRVerifyPasswordResponse class]);
          OCMStub([mockVerifyPasswordResponse IDToken]).andReturn(kAccessToken);
          OCMStub([mockVerifyPasswordResponse approximateExpirationDate])
              .andReturn([NSDate dateWithTimeIntervalSinceNow:kAccessTokenTimeToLive]);
          OCMStub([mockVerifyPasswordResponse refreshToken]).andReturn(kRefreshToken);
          callback(mockVerifyPasswordResponse, nil);
        });
      });
  [self expectGetAccountInfoWithMockUserInfoResponse:mockUserInfoResponse];
  [[FIRAuth auth] signOut:NULL];
  [[FIRAuth auth] signInWithEmail:kEmail
                         password:kFakePassword
                       completion:^(FIRAuthDataResult *_Nullable result, NSError *_Nullable error) {
                         XCTAssertNotNil(result.user);
                         XCTAssertNil(error);
                         completion(result.user);
                       }];
}

/** @fn signInWithEmailLinkWithMockGetAccountInfoResponse:completion:
    @brief Signs in with an email link auth account with mocked backend end calls.
    @param mockUserInfoResponse A mocked FIRGetAccountInfoResponseUser object.
    @param completion The completion block that takes the newly signed-in user as the only
        parameter.
 */
- (void)signInWithEmailLinkWithMockUserInfoResponse:(id)mockUserInfoResponse
                                         completion:(void (^)(FIRUser *user))completion {
  OCMExpect([_mockBackend emailLinkSignin:[OCMArg any] callback:[OCMArg any]])
      .andCallBlock2(^(FIREmailLinkSignInRequest *_Nullable request,
                       FIREmailLinkSigninResponseCallback callback) {
        id mockVerifyLinkResponse = OCMClassMock([FIREmailLinkSignInResponse class]);
        OCMStub([mockVerifyLinkResponse IDToken]).andReturn(kAccessToken);
        OCMStub([mockVerifyLinkResponse approximateExpirationDate])
            .andReturn([NSDate dateWithTimeIntervalSinceNow:kAccessTokenTimeToLive]);
        OCMStub([mockVerifyLinkResponse refreshToken]).andReturn(kRefreshToken);
        callback(mockVerifyLinkResponse, nil);
      });
  [self expectGetAccountInfoWithMockUserInfoResponse:mockUserInfoResponse];
  [[FIRAuth auth] signOut:NULL];
  [[FIRAuth auth] signInWithEmail:kEmail
                             link:@"https://www.google.com?oobCode=aCode&mode=signIn"
                       completion:^(FIRAuthDataResult *_Nullable result, NSError *_Nullable error) {
                         XCTAssertNotNil(result.user);
                         XCTAssertNil(error);
                         completion(result.user);
                       }];
}

/** @fn expectGetAccountInfoWithMockUserInfoResponse:
    @brief Expects a GetAccountInfo request on the mock backend and calls back with provided
        fake account data.
    @param mockUserInfoResponse A mock @c FIRGetAccountInfoResponseUser object containing user info.
 */
- (void)expectGetAccountInfoWithMockUserInfoResponse:(id)mockUserInfoResponse {
  OCMExpect([self->_mockBackend getAccountInfo:[OCMArg any] callback:[OCMArg any]])
      .andCallBlock2(^(FIRGetAccountInfoRequest *_Nullable request,
                       FIRGetAccountInfoResponseCallback callback) {
        XCTAssertEqualObjects(request.APIKey, kAPIKey);
        XCTAssertEqualObjects(request.accessToken, kAccessToken);
        dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
          id mockGetAccountInfoResponse = OCMClassMock([FIRGetAccountInfoResponse class]);
          OCMStub([mockGetAccountInfoResponse users]).andReturn(@[ mockUserInfoResponse ]);
          callback(mockGetAccountInfoResponse, nil);
        });
      });
}

/** @fn signInWithCustomTokenNoRefreshTokenWithCompletion:
    @brief Signs in with a custom token with mocked backend calls, without returning a refresh
        token in the response.
    @param completion The completion block that takes the newly signed-in user as the only
        parameter.
 */
- (void)signInWithCustomTokenNoRefreshTokenWithCompletion:(void (^)(FIRUser *user))completion {
  OCMExpect([_mockBackend verifyCustomToken:[OCMArg any] callback:[OCMArg any]])
      .andCallBlock2(^(FIRVerifyCustomTokenRequest *_Nullable request,
                       FIRVerifyCustomTokenResponseCallback callback) {
        XCTAssertEqualObjects(request.APIKey, kAPIKey);
        XCTAssertEqualObjects(request.token, kCustomToken);
        XCTAssertTrue(request.returnSecureToken);
        dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
          id mockVerifyCustomTokenResponse = OCMClassMock([FIRVerifyCustomTokenResponse class]);
          [self stubTokensWithMockResponseNoRefreshToken:mockVerifyCustomTokenResponse];
          callback(mockVerifyCustomTokenResponse, nil);
        });
      });
  [[FIRAuth auth] signOut:NULL];
  [[FIRAuth auth]
      signInWithCustomToken:kCustomToken
                 completion:^(FIRAuthDataResult *_Nullable result, NSError *_Nullable error) {
                   XCTAssertTrue([NSThread isMainThread]);
                   [self assertUserFromIDToken:result.user];
                   XCTAssertNil(error);
                   completion(result.user);
                 }];
}

/** @fn dictionaryWithUserInfoArray:
    @brief Converts an array of @c FIRUserInfo into a dictionary that indexed by provider IDs.
    @param userInfoArray An array of @c FIRUserInfo objects.
    @return A dictionary contains same values as @c userInfoArray does but keyed by their
        @c providerID .
 */
- (NSDictionary<NSString *, id<FIRUserInfo>> *)dictionaryWithUserInfoArray:
    (NSArray<id<FIRUserInfo>> *)userInfoArray {
  NSMutableDictionary<NSString *, id<FIRUserInfo>> *map =
      [NSMutableDictionary dictionaryWithCapacity:userInfoArray.count];
  for (id<FIRUserInfo> userInfo in userInfoArray) {
    XCTAssertNil(map[userInfo.providerID]);
    map[userInfo.providerID] = userInfo;
  }
  return map;
}

/** @fn stubSecureTokensWithMockResponse
    @brief Creates stubs on the mock response object with access and refresh tokens
    @param mockResponse The mock response object.
 */
- (void)stubTokensWithMockResponse:(id)mockResponse {
  OCMStub([mockResponse IDToken]).andReturn(kAccessToken);
  OCMStub([mockResponse approximateExpirationDate])
      .andReturn([NSDate dateWithTimeIntervalSinceNow:kAccessTokenTimeToLive]);
  OCMStub([mockResponse refreshToken]).andReturn(kRefreshToken);
}

/** @fn stubTokensWithMockResponseNoRefreshToken
    @brief Creates stubs on the mock response object with only access token, no refresh token.
    @param mockResponse The mock response object.
 */
- (void)stubTokensWithMockResponseNoRefreshToken:(id)mockResponse {
  OCMStub([mockResponse IDToken]).andReturn(kAccessToken);
  OCMStub([mockResponse approximateExpirationDate])
      .andReturn([NSDate dateWithTimeIntervalSinceNow:kAccessTokenTimeToLive]);
  OCMStub([mockResponse refreshToken]).andReturn(nil);
}

/** @fn assertUserGoogle
    @brief Asserts the given FIRUser matching the fake data returned by
        @c expectGetAccountInfo:federatedID:displayName: .
    @param user The user object to be verified.
 */
- (void)assertUserGoogle:(FIRUser *)user {
  XCTAssertNotNil(user);
  XCTAssertEqualObjects(user.uid, kLocalID);
  XCTAssertEqualObjects(user.displayName, kGoogleDisplayName);
  XCTAssertEqual(user.providerData.count, 1u);
  id<FIRUserInfo> googleUserInfo = user.providerData[0];
  XCTAssertEqualObjects(googleUserInfo.providerID, FIRGoogleAuthProviderID);
  XCTAssertEqualObjects(googleUserInfo.uid, kGoogleID);
  XCTAssertEqualObjects(googleUserInfo.displayName, kGoogleDisplayName);
  XCTAssertEqualObjects(googleUserInfo.email, kGoogleEmail);
}

/** @fn assertUserFacebook
    @brief Asserts the given FIRUser matching the fake data returned by
        @c expectGetAccountInfo:federatedID:displayName: .
    @param user The user object to be verified.
 */
- (void)assertUserFacebook:(FIRUser *)user {
  XCTAssertNotNil(user);
  XCTAssertEqualObjects(user.uid, kLocalID);
  XCTAssertEqualObjects(user.displayName, kFacebookDisplayName);
  XCTAssertEqual(user.providerData.count, 1u);
  id<FIRUserInfo> googleUserInfo = user.providerData[0];
  XCTAssertEqualObjects(googleUserInfo.providerID, FIRFacebookAuthProviderID);
  XCTAssertEqualObjects(googleUserInfo.uid, kFacebookID);
  XCTAssertEqualObjects(googleUserInfo.displayName, kFacebookDisplayName);
  XCTAssertEqualObjects(googleUserInfo.email, kGoogleEmail);
}

/** @fn assertUserFromIDToken
    @brief Asserts the given FIRUser matching the fake data returned by a IDToken.
    @param user The user object to be verified.
 */
- (void)assertUserFromIDToken:(FIRUser *)user {
  XCTAssertNotNil(user);
  XCTAssertEqualObjects(user.uid, @"test_user_id");
  XCTAssertFalse(user.anonymous);
  XCTAssertEqual(user.providerData.count, 0u);
}

/** @fn expectGetAccountInfo:federatedID:displayName:
    @brief Expects a GetAccountInfo request on the mock backend and calls back with fake account
        data for a Google Sign-In user.
 */
- (void)expectGetAccountInfo:(NSString *)providerId
                 federatedID:(NSString *)federatedID
                 displayName:(NSString *)displayName {
  OCMExpect([self->_mockBackend getAccountInfo:[OCMArg any] callback:[OCMArg any]])
      .andCallBlock2(^(FIRGetAccountInfoRequest *_Nullable request,
                       FIRGetAccountInfoResponseCallback callback) {
        XCTAssertEqualObjects(request.APIKey, kAPIKey);
        XCTAssertEqualObjects(request.accessToken, kAccessToken);
        dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
          id mockGoogleUserInfo = OCMClassMock([FIRGetAccountInfoResponseProviderUserInfo class]);
          OCMStub([mockGoogleUserInfo providerID]).andReturn(providerId);
          OCMStub([mockGoogleUserInfo displayName]).andReturn(displayName);
          OCMStub([mockGoogleUserInfo federatedID]).andReturn(federatedID);
          OCMStub([mockGoogleUserInfo email]).andReturn(kGoogleEmail);
          id mockGetAccountInfoResponseUser = OCMClassMock([FIRGetAccountInfoResponseUser class]);
          OCMStub([mockGetAccountInfoResponseUser localID]).andReturn(kLocalID);
          OCMStub([mockGetAccountInfoResponseUser displayName]).andReturn(displayName);
          OCMStub([mockGetAccountInfoResponseUser providerUserInfo])
              .andReturn((@[ mockGoogleUserInfo ]));
          id mockGetAccountInfoResponse = OCMClassMock([FIRGetAccountInfoResponse class]);
          OCMStub([mockGetAccountInfoResponse users]).andReturn(@[
            mockGetAccountInfoResponseUser
          ]);
          callback(mockGetAccountInfoResponse, nil);
        });
      });
}

/** @fn expectVerifyAssertionRequest:federatedID:displayName:profile:providerAccessToken:
    @brief Expects a Verify Assertion request on the mock backend and calls back with fake account
        data.
 */
- (void)expectVerifyAssertionRequest:(NSString *)providerId
                         federatedID:(NSString *)federatedID
                         displayName:(NSString *)displayName
                             profile:(NSDictionary *)profile
                     providerIDToken:(nullable NSString *)providerIDToken
                 providerAccessToken:(NSString *)providerAccessToken {
  OCMExpect([_mockBackend verifyAssertion:[OCMArg any] callback:[OCMArg any]])
      .andCallBlock2(^(FIRVerifyAssertionRequest *_Nullable request,
                       FIRVerifyAssertionResponseCallback callback) {
        XCTAssertEqualObjects(request.APIKey, kAPIKey);
        XCTAssertEqualObjects(request.providerID, providerId);
        XCTAssertEqualObjects(request.providerIDToken, providerIDToken);
        XCTAssertEqualObjects(request.providerAccessToken, providerAccessToken);
        XCTAssertTrue(request.returnSecureToken);
        dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
          id mockVerifyAssertionResponse = OCMClassMock([FIRVerifyAssertionResponse class]);
          OCMStub([mockVerifyAssertionResponse federatedID]).andReturn(federatedID);
          OCMStub([mockVerifyAssertionResponse providerID]).andReturn(providerId);
          OCMStub([mockVerifyAssertionResponse localID]).andReturn(kLocalID);
          OCMStub([mockVerifyAssertionResponse displayName]).andReturn(displayName);
          OCMStub([mockVerifyAssertionResponse profile]).andReturn(profile);
          OCMStub([mockVerifyAssertionResponse username]).andReturn(kUserName);
          [self stubTokensWithMockResponse:mockVerifyAssertionResponse];
          callback(mockVerifyAssertionResponse, nil);
        });
      });
  [self expectGetAccountInfo:providerId federatedID:federatedID displayName:displayName];
}

#if TARGET_OS_IOS
/** @fn expectVerifyPhoneNumberRequestWithPhoneNumber:error:
    @brief Expects a verify phone numner request on the mock backend and calls back with fake
        account data or an error.
    @param phoneNumber Optionally; The phone number to use in the mocked response.
    @param isLinkOperation Boolean value that indicates whether or not this method is triggered by
        a link operation.
    @param error Optionally; The error to return in the mocked response.
 */
- (void)expectVerifyPhoneNumberRequestWithPhoneNumber:(nullable NSString *)phoneNumber
                                      isLinkOperation:(BOOL)isLinkOperation
                                                error:(nullable NSError *)error {
  OCMExpect([self->_mockBackend verifyPhoneNumber:[OCMArg any] callback:[OCMArg any]])
      .andCallBlock2(^(FIRVerifyPhoneNumberRequest *_Nullable request,
                       FIRVerifyPhoneNumberResponseCallback callback) {
        XCTAssertEqualObjects(request.verificationID, kVerificationID);
        XCTAssertEqualObjects(request.verificationCode, kVerificationCode);
        if (isLinkOperation) {
          XCTAssertEqual(request.operation, FIRAuthOperationTypeLink);
        } else {
          XCTAssertEqual(request.operation, FIRAuthOperationTypeUpdate);
        }
        XCTAssertEqualObjects(request.accessToken, kAccessToken);
        dispatch_async(FIRAuthGlobalWorkQueue(), ^() {
          if (error) {
            callback(nil, error);
            return;
          }
          id mockVerifyPhoneNumberResponse = OCMClassMock([FIRVerifyPhoneNumberResponse class]);
          OCMStub([mockVerifyPhoneNumberResponse phoneNumber]).andReturn(phoneNumber);
          OCMStub([mockVerifyPhoneNumberResponse IDToken]).andReturn(kAccessToken);
          OCMStub([mockVerifyPhoneNumberResponse approximateExpirationDate])
              .andReturn([NSDate dateWithTimeIntervalSinceNow:kAccessTokenTimeToLive]);
          OCMStub([mockVerifyPhoneNumberResponse refreshToken]).andReturn(kRefreshToken);
          callback(mockVerifyPhoneNumberResponse, nil);
        });
      });
}
#endif

@end

NS_ASSUME_NONNULL_END